chore(.github): upgrade and align actions across workflows with their tagged versions

[darccio]

What does this PR do?

Upgrades and makes sure all actions are aligned with a tagged version, so we don't track their main branches accidentally.

Reviewer's Checklist

• Changed code has unit tests for its functionality at or near 100% coverage.
• System-Tests covering this feature have been added and enabled with the va.b.c-dev version tag.
• There is a benchmark for any new code, or changes to existing code.
• If this interacts with the agent in a new way, a system test has been added.
• New code is free of linting errors. You can check this by running ./scripts/lint.sh locally.
• Add an appropriate team label so this PR gets put in the right place for the release notes.
• Non-trivial go.mod changes, e.g. adding new modules, are reviewed by @DataDog/dd-trace-go-guild.

Unsure? Have a question? Request a review!

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-08-12 08:53:43

Comparing candidate commit 8ebf320 in PR branch dario.castane/ktlo/align-actions-commit-hashes with baseline commit 50dc5f6 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 24 metrics, 0 unstable metrics.

[kakkoyun]

LGTM