prepare_release_notes compatibility with 22.0-mc20

Edit the regex in the script to not fail parsing the nightly argument when used for releases 22.0.41.X built from branch 22.0-mc20.

This merge request affects 1 package:

• Build

This merge request affects 1 file:

• Build/AtlasBuildScripts/prepare_release_notes.py

Adding @akraszna as watcher

added Build master review-pending-level-1 labels

CI Result SUCCESS (hash 5ecdeb23)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 61296]

Looks good, approving - L1

added review-approved label and removed review-pending-level-1 label

Is this really meant for the master branch?

• Walter

resolved all threads

merged

mentioned in commit f43f169e

added sweep:ignore label