Update a few deps

[oliver006]

golang 1.24
github.com/prometheus/client_golang v1.21.1
alpine:3.21 for exporter docker image

and assorted test instance updates

[coveralls]

Pull Request Test Coverage Report for Build 13714040580

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 3 of 3 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 85.443%

---

Totals
Change from base Build 13692689989:	0.0%
Covered Lines:	2342
Relevant Lines:	2741

---

💛 - Coveralls

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.06%. Comparing base (3eb0d6e) to head (774b5d8).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #982   +/-   ##
=======================================
  Coverage   82.06%   82.06%           
=======================================
  Files          18       18           
  Lines        2732     2732           
=======================================
  Hits         2242     2242           
  Misses        399      399           
  Partials       91       91           

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