fix: add missing const to _write_reg
#147
| Job | Run time |
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| 8s | |
| 8s | |
| 2m 10s | |
| 0s | |
| 4m 16s | |
| 4m 1s | |
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| 1m 6s | |
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| 4m 1s | |
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| 1m 16s | |
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| 1m 5s | |
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| 3m 4s | |
| 59s | |
| 1m 9s | |
| 3m 2s | |
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| 57s | |
| 3m 24s | |
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| 58s | |
| 58s | |
| 3m 8s | |
| 1m 8s | |
| 1m 9s | |
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| 3m 12s | |
| 56s | |
| 1m 0s | |
| 3m 4s | |
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| 54s | |
| 1h 19m 46s |