Update proc-macro2 version requirement to 1.0.80
#2699
| Job | Run time |
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| 53s | |
| 19s | |
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| 29s | |
| 1m 38s | |
| 6s | |
| 1m 38s | |
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| 1m 38s | |
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| 1m 37s | |
| 2m 9s | |
| 2m 12s | |
| 2m 29s | |
| 2m 6s | |
| 6m 46s | |
| 6m 55s | |
| 4m 12s | |
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| 4m 56s | |
| 5m 19s | |
| 4m 49s | |
| 4m 47s | |
| 2m 25s | |
| 1m 55s | |
| 1s | |
| 1h 6m 46s |