bump nim-metrics to `29bb7ba63cd884770169891687595348a70cf166`

[etan-status]

• Fix chronos dependency to require version >= v4.0.3
• make chronicles work with metrics logging

[github-actions[bot]]

Unit Test Results

         9 files  ±0    1 337 suites  ±0   46m 14s :stopwatch: + 2m 23s   5 066 tests ±0    4 718 :heavy_check_mark: ±0  348 :zzz: ±0  0 :x: ±0  20 997 runs  ±0  20 593 :heavy_check_mark: ±0  404 :zzz: ±0  0 :x: ±0 

Results for commit 537dbb7a. ± Comparison against base commit 73be2af0.