fix(deps): update module github.com/prometheus/client_golang to v1.20.2

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/prometheus/client_golang	v1.20.1 -> v1.20.2

---

Release Notes

prometheus/client_golang (github.com/prometheus/client_golang)

v1.20.2

Compare Source

• [BUGFIX] promhttp: Unset Content-Encoding header when data is uncompressed. #​1596

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.5%. Comparing base (3b44a34) to head (bbc20fe).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #5733   +/-   ##
=====================================
  Coverage   84.5%   84.5%           
=====================================
  Files        272     272           
  Lines      22661   22661           
=====================================
+ Hits       19155   19156    +1     
+ Misses      3166    3165    -1     
  Partials     340     340           

see 2 files with indirect coverage changes