Add placeholder python 3.9 (#1933) #3505

Job	Run time
Lint	3m 22s
Lint for Docs	12s
macOS	40m 49s
Bazel macOS	24m 54s
Bazel Linux	42m 10s
Linux	9m 2s
Build Number	3s
Bazel Windows	21m 50s
Wheel ${{ matrix.python }} Windows	0s
Test ${{ matrix.python }} Windows	0s
Nightly ${{ matrix.python }} Windows	0s
Wheel 3.9 macOS	33s
Wheel 3.10 macOS	46s
Wheel 3.11 macOS	33s
Nightly 3.9 macOS	8s
Nightly 3.10 macOS	8s
Test 3.9 macOS	58m 56s
Nightly 3.11 macOS	7s
Wheel 3.9 Linux	1m 1s
Wheel 3.10 Linux	1m 10s
Wheel 3.11 Linux	1m 1s
Nightly 3.9 Linux	5s
Nightly 3.10 Linux	8s
Test 3.9 Linux	25m 56s
Nightly 3.11 Linux	8s
Release	16s
Docker Nightly	0s
Nightly	0s
Release Candidate	47s
Docker Release	0s
	3h 54m 5s

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