Docs: pin sphinx to <9.0
#8181
| Job | Run time |
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| 20s | |
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| 1m 51s | |
| 3m 23s | |
| 1m 14s | |
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| 3m 50s | |
| 8m 16s | |
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| 2m 10s | |
| 2m 3s | |
| 8m 19s | |
| 47s | |
| 47s | |
| 9m 53s | |
| 7m 4s | |
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| 49s | |
| 7m 47s | |
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| 2m 14s | |
| 1m 42s | |
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| 1m 54s | |
| 4m 21s | |
| 2m 54s | |
| 51s | |
| 53s | |
| 3s | |
| 1h 53m 59s |