Update to Dart 2.13

[robbecker-wf]

Motivation

We want to update everything at Workvia to work with Dart 2.13

Changes

Update dependencies and Dockerfile to work under Dart 2.13
Removes last use of dart2_constant

Release Notes

Review

See CONTRIBUTING.md for more details on review types (+1 / QA +1 / +10) and code review process.

Please review:

QA Checklist

• Tests were updated and provide good coverage of the changeset and other affected code
• Manual testing was performed if needed
  • Steps from PR author:
  • Anything falling under manual testing criteria outlined in CONTRIBUTING.md

Merge Checklist

While we perform many automated checks before auto-merging, some manual checks are needed:

• A Client Platform member has reviewed these changes
• There are no unaddressed comments - this check can be automated if reviewers use the "Request Changes" feature
• For release PRs - Version metadata in Rosie comment is correct

[aviary2-wf]

Security Insights

No security relevant content was detected by automated scans.

Action Items

• Review PR for security impact; comment "security review required" if needed or unsure
• Verify aviary.yaml coverage of security relevant code

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Questions or Comments? Reach out on Slack: #support-infosec.

[robbecker-wf]

@rmconsole-wf how you doing? You've been catatonic for hours.

[robbecker-wf]

Comment to restart Rosie

[robbecker-wf]

Using the google image for open source projects

[robbecker-wf]

@Workiva/release-management-p

[rmconsole-wf]

+1 from RM