Bump minimum python version #3831

Job	Run time
test-with-sslib-main / Test securesystemslib main branch (not a merge blocker)	24s
test / Lint Test	24s
test / Tests (3.10, ubuntu-latest)	21s
test / Tests (3.x, windows-latest)	1m 7s
test / Tests (3.11, ubuntu-latest)	20s
test / Tests (3.x, macos-latest)	32s
test / Tests (3.12, ubuntu-latest)	20s
test / Tests (3.14, ubuntu-latest)	16s
test / Tests (3.13, ubuntu-latest)	21s
test / All tests passed	3s
test / coveralls-fin	10s
	4m 18s

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