minor tweak release notes for v4.5.3

Author: boegel

RELEASE_NOTES

@@ -14,10 +14,10 @@ update/bugfix release
   - add end2end test for 'eb --containerize' (#3958)
 - various bug fixes, including:
   - take into account that patch files can also be zipped when checking filename extension for patches (#3936)
-  - initialize BACKUP_PKG_URL in install_eb_dep.sh with empty string (#3939)
+  - initialize BACKUP_PKG_URL with empty string in install_eb_dep.sh script (#3939)
   - fix get_os_name and get_os_version to avoid reporting UNKNOWN in output of eb --show-system-info (#3942)
-  - consistently use actions/setup-python (#3944)
-  - switch to using pip3 for installing EasyBuild in Singularity definition file generated by EasyBuild (#3945)
+  - consistently use actions/setup-python@v2 in CI workflows (#3944)
+  - switch to using pip3 for installing EasyBuild in container recipes generated by EasyBuild (#3945)
   - specify easybuild.io as EasyBuild homepage in setup.py (#3947)
   - avoid crash in get_os_version on modern SLES-based OSs (#3955)
 - other changes: