chore: Upgrade dart version and pub deps

[CelticMajora]

📰 Summary of changes

Upgrades dart sdk version as well as dev dependencies for:

• build_runner
• freezed
• json_serializable
• test

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/domain @Betterment/better_test_reporter-maintainers
/no-platform

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[github-actions]

LCOV of commit 1daac26 during CI #59

Summary coverage rate:
  lines......: 95.6% (172 of 180 lines)
  functions..: no data found
  branches...: no data found

Files changed coverage rate: n/a

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[btrautmann]

<< domain lgtm

[CelticMajora]

nanda?

[nanda-prbot]

Approved! 🌟 🌮 🎇