docs: Add release notes for 1.13.5

Author: simonswine

docs/sources/release-notes/v1-13.md

@@ -5,13 +5,32 @@ description: Release notes for Grafana Pyroscope 1.13
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+## Version 1.13.5 release notes
+
+Maintenance release to address security advisories.
+
+
+### Changes
+
+* Update golang version to 1.23.10 ([#4245](https://github.com/grafana/pyroscope/pull/4245))
+* Update golang.org/x/net to v0.38.0 to address CVE-2025-22872
+
+
+## Version 1.13.4 release notes
+
+This was a release to test the health of our CI pipelines
+
+## Version 1.13.3
+
+This release version was skipped
+
 ## Version 1.13.2 release notes
 
 To address bugs found in v1.13.1, we have released a patch version
 
 Notable changes are listed below. For more details, check out the [1.13.2 changelog](https://github.com/grafana/pyroscope/compare/v1.13.1...v1.13.2).
 
-### Fixes
+### Changes
 
 * Update golang version to 1.23.8 ([#4116](https://github.com/grafana/pyroscope/pull/4116))