[ty] Use better datetime format for server logs

[dhruvmanila]

This PR improves the timer format for ty server logs to be same as Ruff.

Ref: #16389

[github-actions]

mypy_primer results

Changes were detected when running on open source projects

pegen (https://github.com/we-like-parsers/pegen)
- TOTAL MEMORY USAGE: ~45MB
+ TOTAL MEMORY USAGE: ~41MB

pydantic (https://github.com/pydantic/pydantic)
- TOTAL MEMORY USAGE: ~156MB
+ TOTAL MEMORY USAGE: ~142MB

jinja (https://github.com/pallets/jinja)
- TOTAL MEMORY USAGE: ~106MB
+ TOTAL MEMORY USAGE: ~97MB

paasta (https://github.com/yelp/paasta)
-     memo fields = ~171MB
+     memo fields = ~156MB

isort (https://github.com/pycqa/isort)
- TOTAL MEMORY USAGE: ~80MB
+ TOTAL MEMORY USAGE: ~88MB

tornado (https://github.com/tornadoweb/tornado)
-     memo fields = ~129MB
+     memo fields = ~142MB

static-frame (https://github.com/static-frame/static-frame)
-     memo fields = ~304MB
+     memo fields = ~334MB

openlibrary (https://github.com/internetarchive/openlibrary)
-     memo fields = ~171MB
+     memo fields = ~189MB

rotki (https://github.com/rotki/rotki)
-     memo fields = ~490MB
+     memo fields = ~445MB