Issue #3455923: Changelog for next release.

CHANGELOG.md

 # GitLab Templates Changelog
 
+## 1.5.1 - 2024-06-20
+
+#3455923 - Allow scheduled pipelines from non 'project' namespace.\
+#3454363 - CSPELL ignores files in hidden folders.\
+#3453105 - Include a phpstan baseline without a custom phpstan.neon file.
+
 ## 1.5.0 - 2024-06-13
 
 #3449098 - Linting skips files ending in .theme, .profile and .engine.\