FEDX-1453: dart 2.19 min

[matthewnitschke-wk]

FEDX-1453

There's not really a good reason that we're supporting a lower bound of dart 2.18, bumping the project to a lower bound of 2.19, so we can implement the most up to date analyzer version that still supports dart 2

There's active work to figure out the best way of supporting both dart 2 and 3, this is somewhat of a precursor to that work

[aviary3-wk]

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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[alanknight-wk]

@Workiva/release-management-p

[rmconsole-wf]

+1 from RM