CP: Use git rev-parse to get last commit sha (#6366)

[hekota]

Do not use git describe, it is using tags which might be out of date and unrelated to the current build and version.

(cherry picked from commit aaab2a7)

[github-actions]

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You can test this locally with the following command:

darker --check --diff -r 9403822342b01188e1f653da4643491163b48cfc..fdb8f60cef2a47b78ea0cc92e0d9983c0f4fac82 utils/version/gen_version.py

View the diff from darker here.

--- gen_version.py	2024-02-29 20:58:53.000000 +0000
+++ gen_version.py	2024-02-29 21:00:35.525233 +0000
@@ -36,10 +36,11 @@
     return output.decode('ASCII').strip()
 
 def is_dirty():
     diff = get_output_of(["git", "diff", "HEAD", "--shortstat"])
     return len(diff.strip()) != 0
+
 
 def get_last_commit_sha():
     try:
         sha = get_output_of(["git", "rev-parse", "--short", "HEAD"])
         if is_dirty():

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