fix(keyboard): suppress invalid input on <input type="number">

[ph-fritsche]

What:

Ignore otherwise valid characters that do not trigger input events and change the displayed value at that position.

Why:

Closes #606

How:

Test the resulting new value against known invalid patterns.

Checklist:

• N/A Documentation
• Tests
• Ready to be merged

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[codecov]

Codecov Report

Merging #628 (c08378b) into master (51bffe9) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #628   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           48        48           
  Lines          885       891    +6     
  Branches       347       351    +4     
=========================================
+ Hits           885       891    +6     

Impacted Files	Coverage Δ
src/keyboard/plugins/character.ts	100.00% <100.00%> (ø)

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[github-actions]

🎉 This PR is included in version 13.0.16 🎉

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• GitHub release

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