Move tests to py3.12. Implements #2146 #3858

Job	Run time
Build and upload Documentation (3.12)	2m 4s
Run Security Checks (3.12)	1m 26s
Generate Code Coverage (3.12)	3m 19s
Unit Tests (Python 3.14)	2m 59s
Build and Verify Docker Image (3.12)	1m 30s
Unit Tests (Python 3.11)	1m 53s
Unit Tests (Python pypy-3.10)	2m 37s
Unit Tests (Python 3.13)	2m 15s
Micro Benchmarks (3.12)	2m 14s
Unit Tests (Python 3.12)	1m 57s
Unit Tests (Python 3.10)	2m 20s
Run Various Lint and Other Checks (3.12)	4m 21s
Build and Test Release Artifact (3.12)	2m 30s
	31m 25s

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