build: Update `FindFilesystem.cmake`

[paulgessinger]

Vector-of-bool's FindFilesystem.cmake was updated at some point to include and explicit CMAKE_CXX_STANDARD=17. We've observed occasionally that on macOS, the find module would fail because it would default to C++14, where std::filesystem is not available (and I guess the experimental implementation has since been removed).

This PR updates the FindFilesystem.cmake to include this.

Fixes #3900

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[paulgessinger]

Updated to reset the original value of CMAKE_CXX_STANDARD or unsetting if it was not set before.

[github-actions[bot]]

📊: Physics performance monitoring for 0c5bf3e6df0f3037914e1e243e44b766100f454d

Full contents

physmon summary

• ✅ Particles fatras
• ✅ Particles geant4
• ✅ Particles ttbar
• ✅ Vertices ttbar
• ✅ Truth tracking (KF)
• ✅ Truth tracking (GSF)
• ✅ Truth tracking (GX2F)
• ✅ Truth tracking (KF refit)
• ✅ Truth tracking (GSF refit)
• ✅ CKF finding performance | trackfinding | single muon | truth smeared seeding
• ✅ CKF fitting performance | trackfinding | single muon | truth smeared seeding
• ✅ CKF track summary | trackfinding | single muon | truth smeared seeding
• ✅ Seeding trackfinding | single muon | truth estimated seeding
• ✅ CKF finding performance | trackfinding | single muon | truth estimated seeding
• ✅ CKF fitting performance | trackfinding | single muon | truth estimated seeding
• ✅ CKF track summary | trackfinding | single muon | truth estimated seeding
• ✅ Seeding trackfinding | single muon | default seeding
• ✅ CKF finding performance | trackfinding | single muon | default seeding
• ✅ CKF fitting performance | trackfinding | single muon | default seeding
• ✅ CKF track summary | trackfinding | single muon | default seeding
• ✅ Seeding trackfinding | single muon | orthogonal seeding
• ✅ CKF finding performance | trackfinding | single muon | orthogonal seeding
• ✅ CKF fitting performance | trackfinding | single muon | orthogonal seeding
• ✅ CKF track summary | trackfinding | single muon | orthogonal seeding
• ✅ Seeding trackfinding | 4 muon x 50 vertices | default seeding
• ✅ CKF finding performance | trackfinding | 4 muon x 50 vertices | default seeding
• ✅ CKF fitting performance | trackfinding | 4 muon x 50 vertices | default seeding
• ✅ CKF track summary | trackfinding | 4 muon x 50 vertices | default seeding
• ✅ Ambisolver finding performance | trackfinding | 4 muon x 50 vertices | default seeding
• ✅ IVF notime | trackfinding | 4 muon x 50 vertices | default seeding
• ✅ AMVF gauss notime | trackfinding | 4 muon x 50 vertices | default seeding
• ✅ AMVF grid time | trackfinding | 4 muon x 50 vertices | default seeding
• ✅ Seeding trackfinding | ttbar with 200 pileup | default seeding
• ✅ CKF finding performance | trackfinding | ttbar with 200 pileup | default seeding
• ✅ CKF fitting performance | trackfinding | ttbar with 200 pileup | default seeding
• ✅ CKF track summary | trackfinding | ttbar with 200 pileup | default seeding
• ✅ Ambisolver finding performance | trackfinding | ttbar with 200 pileup | default seeding
• ✅ AMVF gauss notime | trackfinding | ttbar with 200 pileup | default seeding
• ✅ AMVF grid time | trackfinding | ttbar with 200 pileup | default seeding

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[acts-project-service]

:white_check_mark: Athena integration test results [4656a8d5a69da616c613858ffe0b9ecf17686d3e]

:white_check_mark: All tests successful

status	job	report
:green_circle:	report_pull_request
:green_circle:	run_art_test: test_run4_acts_vertex_PU200
:green_circle:	run_art_test: test_run4_ttbar_PU200
:green_circle:	run_art_test: test_data18_13TeV_1000evt
:green_circle:	run_art_test: test_ttbarPU40_reco
:green_circle:	run_workflow_tests_run4_mc
:green_circle:	run_workflow_tests_run2_mc
:green_circle:	run_workflow_tests_run2_data
:green_circle:	run_workflow_tests_run3_mc
:green_circle:	run_workflow_tests_run3_data
:green_circle:	test_ActsDumpGeometryIdentifiers
:green_circle:	test_ActsCheckObjectCountsWorkflowHgtd
:green_circle:	test_ActsCheckObjectCountsCachedWorkflow
:green_circle:	test_ActsCheckObjectCountsWorkflow
:green_circle:	test_ActsEFTrackFit
:green_circle:	test_ActsPersistifySeeds
:green_circle:	test_ActsBenchmarkWithSpot
:green_circle:	test_ActsAnalogueClustering
:green_circle:	test_ActsWorkflowHeavyIons
:green_circle:	test_ActsWorkflowFastTracking
:green_circle:	test_ActsWorkflowCached
:green_circle:	test_ActsWorkflow
:green_circle:	test_ActsValidateAmbiguityResolution
:green_circle:	test_ActsValidateResolvedTracks
:green_circle:	test_ActsValidateTracks
:green_circle:	test_ActsValidateActsCoreSpacePoints
:green_circle:	test_ActsValidateActsSpacePoints
:green_circle:	test_ActsValidateSeeds
:green_circle:	test_ActsValidateOrthogonalSeeds
:green_circle:	test_ActsValidateClusters
:green_circle:	test_ActsPersistifyEDM
:green_circle:	test_ActsGSFRefitting
:green_circle:	test_ActsKfRefitting
:green_circle:	test_ActsExtrapolationAlgTest
:green_circle:	test_ActsITkTest
:green_circle:	run_unit_tests