refactor(templates): Drop support for Python 3.8 in templates #6525

Job	Run time
External Tests	2m 11s
Test on 3.8 (tests) / ubuntu-latest / SQLAlchemy: 2	42s
Test on 3.9 (tests) / ubuntu-latest / SQLAlchemy: 2	44s
Test on 3.10 (tests) / ubuntu-latest / SQLAlchemy: 2	41s
Test on 3.11 (tests) / ubuntu-latest / SQLAlchemy: 2	49s
Test on 3.12 (tests) / ubuntu-latest / SQLAlchemy: 2	41s
Test on 3.8 (tests) / macos-latest / SQLAlchemy: 2	1m 15s
Test on 3.9 (tests) / macos-latest / SQLAlchemy: 2	43s
Test on 3.10 (tests) / macos-latest / SQLAlchemy: 2	46s
Test on 3.11 (tests) / macos-latest / SQLAlchemy: 2	1m 1s
Test on 3.12 (tests) / macos-latest / SQLAlchemy: 2	38s
Test on 3.8 (tests) / windows-latest / SQLAlchemy: 2	1m 44s
Test on 3.9 (tests) / windows-latest / SQLAlchemy: 2	1m 36s
Test on 3.10 (tests) / windows-latest / SQLAlchemy: 2	1m 56s
Test on 3.11 (tests) / windows-latest / SQLAlchemy: 2	1m 58s
Test on 3.12 (tests) / windows-latest / SQLAlchemy: 2	1m 57s
Test on 3.12 (tests) / ubuntu-latest / SQLAlchemy: 1	45s
Test on 3.12 (doctest) / ubuntu-latest / SQLAlchemy: 2	23s
Test on 3.12 (mypy) / ubuntu-latest / SQLAlchemy: 2	40s
Test on 3.12 (deps) / ubuntu-latest / SQLAlchemy: 2	30s
Coverage	28s
	22m 8s

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