build(deps): bump bootstrap from 4.6.0 to 5.2.3

[dependabot[bot]]

Bumps bootstrap from 4.6.0 to 5.2.3.

Commits

• 092589a Update to v5.2.3
• 0b5b793 fix a typo
• b699d70 Clean up Travis
• 4d16b32 Increase :timeout and :process_timeout
• 8db6ce7 CI against newer Ruby and Rails
• 2028026 Add GitHub Actions workflow
• 7d46ee7 Update to v5.2.2
• 6ecce3b Update to v5.2.1
• c548a9a tasks/updater/js.rb: Fix popper reference
• 49a70a4 Add Importmaps section to README
• Additional commits viewable in compare view

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[dependabot[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.