dart pub upgrade --null-safety

[myConsciousness]

1. Description

1.1. Checklist

• [x] The title of my PR starts with a Conventional Commit prefix (fix:, feat:, docs: etc).
• [x] I have read the Contributor Guide and followed the process outlined for submitting PRs.
• [x] I have updated/added tests for ALL new/updated/fixed functionality.
• [x] I have updated/added relevant documentation in docs and added dartdoc comments with ///.
• [x] I have updated/added relevant examples in examples.

1.2. Breaking Change

• [ ] Yes, this is a breaking change.
• [x] No, this is not a breaking change.

1.3. Related Issues

[myConsciousness]

bors merge

[bors[bot]]

This PR was included in a batch that successfully built, but then failed to merge into main (it was a non-fast-forward update). It will be automatically retried.

[codecov-commenter]

Codecov Report

Merging #606 (7dd5ad4) into main (a9cea1b) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 7dd5ad4 differs from pull request most recent head 3339ab0. Consider uploading reports for the commit 3339ab0 to get more accurate results

@@           Coverage Diff           @@
##             main     #606   +/-   ##
=======================================
  Coverage   84.84%   84.84%           
=======================================
  Files         177      177           
  Lines        2297     2297           
=======================================
  Hits         1949     1949           
  Misses        348      348           

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[bors[bot]]

Canceled.

[myConsciousness]

bors merge

[bors[bot]]

Build succeeded:

• analyzer
• test