Add changelog entries for GitHub Actions dependency bumps

Co-authored-by: tpvasconcelos <17701527+tpvasconcelos@users.noreply.github.com>

Author: Copilot

docs/reference/changelog.md

@@ -7,6 +7,11 @@ Unreleased changes
 
 ### CI/CD
 
+- Bump actions/download-artifact from 7 to 8 ({gh-pr}`368`)
+- Bump actions/upload-artifact from 6 to 7 ({gh-pr}`369`)
+- Bump sigstore/gh-action-sigstore-python from 3.2.0 to 3.3.0 ({gh-pr}`370`)
+- Bump codecov/codecov-action from 5 to 6 ({gh-pr}`371`)
+- Bump actions/github-script from 8 to 9 ({gh-pr}`373`)
 - pre-commit autoupdate ({gh-pr}`374`)
 
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