Update python Docker tag to v3.12.0 #1392

Job	Run time
build	3m 56s
provide-agp-version-matrix	3s
Configuration Cache Java-17 OS-ubuntu-latest	5m 19s
icons-test (28)	43s
Configuration Cache Java-17 OS-windows-latest	10m 7s
Configuration Cache Java-17 OS-macos-latest	6m 40s
Configuration Cache Java-20 OS-ubuntu-latest	5m 26s
Configuration Cache Java-20 OS-windows-latest	10m 11s
Configuration Cache Java-20 OS-macos-latest	11m 11s
Run Gradle-release-candidate, AGP-8.1.2, Java-17	12m 44s
Run Gradle-release-candidate, AGP-8.2.0-beta06, Java-17	9m 45s
Run Gradle-release-candidate, AGP-8.3.0-alpha06, Java-17	10m 51s
Run Gradle-release-candidate, AGP-8.1.2, Java-20	10m 25s
Run Gradle-release-candidate, AGP-8.2.0-beta06, Java-20	9m 45s
Run Gradle-release-candidate, AGP-8.3.0-alpha06, Java-20	10m 33s
Run Gradle-7.5, AGP-7.4.1, Java-11	14m 19s
Run Gradle-current, AGP-7.4.1, Java-17	3m 31s
Run Gradle-current, AGP-7.4.1, Java-19	3m 38s
	2h 19m 7s

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