Fix rate limiting in sphinx link checker #2257

Job	Run time
PhotonClient Build	45s
Photonlib - Build Examples - windows-2022	2m 57s
Photonlib - Build Examples - macos-14	3m 16s
Build Offline Docs	49s
Photonlib - Build Examples - ubuntu-22.04	3m 12s
Build Vendor JSON	41s
Gradle Build	3m 13s
Photonlib - Build Docker - Athena	2m 6s
Photonlib - Build Host - Win64	59s
Photonlib - Build Docker - Raspbian	2m 13s
Photonlib - Build Host - macOS	2m 25s
Photonlib - Build Docker - Aarch64	3m 1s
Photonlib - Build Host - Linux	2m 0s
Build fat JAR - ${{ matrix.artifact-name }}	1s
smoketest-${{ matrix.image_suffix }}	1s
Build image - ${{ matrix.image_url }}	1s
run-smoketest-native	1s
Combine	1s
release	1s
dispatch	1s
	27m 44s

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