chore: use macos-15-intel runner for MacOS x86_64 builds
#5369
| Job | Run time |
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| 3s | |
| 4s | |
| 5s | |
| 16m 56s | |
| 20m 43s | |
| 8m 16s | |
| 6m 57s | |
| 8s | |
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| 16s | |
| 29s | |
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| 23s | |
| 16s | |
| 29s | |
| 28s | |
| -1s | |
| 0s | |
| 0s | |
| 4s | |
| 56m 26s |