Fix cargo warning by explicitly specifying a resolver for the workspace

[romac]

Fix the following cargo warning when building the workspace:

warning: some crates are on edition 2021 which defaults to `resolver = "2"`, but virtual workspaces default to `resolver = "1"`
note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest

• [ ] Referenced an issue explaining the need for the change
• [ ] Updated all relevant documentation in docs
• [ ] Updated all code comments where relevant
• [ ] Wrote tests
• [ ] Added entry in .changelog/

[codecov-commenter]

Codecov Report

Merging #1363 (9943ff6) into main (93877da) will not change coverage. Report is 2 commits behind head on main. The diff coverage is n/a.

:exclamation: Current head 9943ff6 differs from pull request most recent head ecec5f2. Consider uploading reports for the commit ecec5f2 to get more accurate results

@@          Coverage Diff          @@
##            main   #1363   +/-   ##
=====================================
  Coverage   61.1%   61.1%           
=====================================
  Files        274     274           
  Lines      26794   26794           
=====================================
  Hits       16386   16386           
  Misses     10408   10408           

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