Update dockerfile template base images

[renovate]

This PR contains the following updates:

Package	Update	Change
ghcr.io/modelcontextprotocol/inspector	patch	0.21.1 → 0.21.2
index.docker.io/library/alpine	digest	2510918 → 5b10f43

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Release Notes

modelcontextprotocol/inspector (ghcr.io/modelcontextprotocol/inspector)

v0.21.2

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.75%. Comparing base (46a1b1f) to head (f519395).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5058      +/-   ##
==========================================
- Coverage   69.78%   69.75%   -0.04%     
==========================================
  Files         560      560              
  Lines       56488    56488              
==========================================
- Hits        39422    39405      -17     
- Misses      14043    14062      +19     
+ Partials     3023     3021       -2     

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