Ensure Gauge is responsively sized

[philippjfr]

Fixes #1868

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 81.80%. Comparing base (54ee768) to head (8762947).

Files	Patch %	Lines
panel/widgets/indicators.py	75.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7034      +/-   ##
==========================================
- Coverage   82.23%   81.80%   -0.44%     
==========================================
  Files         326      326              
  Lines       48271    48278       +7     
==========================================
- Hits        39696    39492     -204     
- Misses       8575     8786     +211     

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