[Merged by Bors] - ci: use sticky-pull-request-comment for updating PR comment

[marcelolynch]

Replace custom PR comment update logic with marocchino/sticky-pull-request-comment for consistency across workflows

[github-actions]

PR summary ea886ccefe

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

---

Declarations diff

No declarations were harmed in the making of this PR! 🐙

You can run this locally as follows

## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>

The doc-module for script/declarations_diff.sh contains some details about this script.

---

No changes to technical debt.

You can run this locally as

./scripts/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).

[grunweg]

Thanks for doing this. This looks good to me, let's have another pair of eyes just in case.
maintainer merge

[github-actions]

🚀 Pull request has been placed on the maintainer queue by grunweg.

[Vierkantor]

Thanks!

bors r+

[mathlib-bors]

Build failed (retrying...):

• ci (staging) / Post-CI job

[mathlib-bors]

Pull request successfully merged into master.

Build succeeded:

• ci (staging) / Build
• ci (staging) / Post-Build Step
• ci (staging) / Lint style
• ci (staging) / Post-CI job