ci: bump actions/cache to v5 and codecov/codecov-action to v6

[xdustinface]

Both actions now run on Node.js 24, silencing the Node.js 20 deprecation warnings GitHub Actions emits. codecov/codecov-action@v6 also pulls in actions/github-script@v8, which removes the second deprecation notice surfaced via the codecov step.

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📥 Commits

Reviewing files that changed from the base of the PR and between 68dff90 and 5c443a8.

📒 Files selected for processing (1)

• .github/workflows/build-and-test.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/bump-actions-to-node24

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.42%. Comparing base (68dff90) to head (5c443a8).

Additional details and impacted files

@@              Coverage Diff              @@
##           v0.42-dev     #741      +/-   ##
=============================================
- Coverage      71.43%   71.42%   -0.02%     
=============================================
  Files            320      320              
  Lines          68770    68770              
=============================================
- Hits           49128    49119       -9     
- Misses         19642    19651       +9     

Flag	Coverage Δ
core	76.51% <ø> (ø)
ffi	46.21% <ø> (+0.01%)	⬆️
rpc	20.00% <ø> (ø)
spv	87.47% <ø> (-0.07%)	⬇️
wallet	70.07% <ø> (ø)
see 4 files with indirect coverage changes