Treat Dart 2.13.4 as the primary SDK version for dev and CI

[todbachman-wf]

Problem:

Currently we treat Dart 2.7.2 as our primary SDK target when running CI. At Workiva, we're transitioning to Dart 2.13.4 as our primary version for development. Perhaps we should treat it as our primary target in CI.

Solution:

• Updated Dockerfile to use the google/dart:2.13.4 image.
• Updated dart_ci.yaml to explicitly run on Dart 2.13.4 and make sure we're checking formatting on that version of the SDK.
  • I left 2.7.2 in the test matrix since we technically still support older versions of Dart.

[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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[todbachman-wf]

QA +1
@Workiva/release-management-pp

[rmconsole-wf]

+1 from RM