fix: useUnmountEffect now invokes changing effect functions

[xobotyi]

fix #756

How does this PR fix the problem?

Use useSyncedRef to handle effector changes.

Checklist

• Have you read contribution guideline?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Is there an existing issue for this PR?
  • useUnmountEffect - callback is not updated when it changes  #756
• Have the files been linted and formatted?
• Have the docs been updated to match the changes in the PR?
• Have the tests been updated to match the changes in the PR?
• Have you run the tests locally to confirm they pass?

[codecov]

Codecov Report

Merging #758 (d5eb0b8) into master (161ac31) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #758   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           52        54    +2     
  Lines          896       916   +20     
  Branches       166       170    +4     
=========================================
+ Hits           896       916   +20     

Impacted Files	Coverage Δ
src/useUnmountEffect/useUnmountEffect.ts	100.00% <100.00%> (ø)
src/index.ts	100.00% <0.00%> (ø)
src/useVibrate/useVibrate.ts	100.00% <0.00%> (ø)
src/__tests__/navigator.vibrate.ts	100.00% <0.00%> (ø)

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[xobotyi]

🎉 This PR is included in version 14.2.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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