Bump exchange-calendars from 4.6 to 4.7

Bumps [exchange-calendars](https://github.com/gerrymanoim/exchange_calendars) from 4.6 to 4.7.
- [Release notes](https://github.com/gerrymanoim/exchange_calendars/releases)
- [Changelog](https://github.com/gerrymanoim/exchange_calendars/blob/master/docs/changes_archive.md)
- [Commits](gerrymanoim/exchange_calendars@4.6...4.7)

---
updated-dependencies:
- dependency-name: exchange-calendars
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -4,5 +4,5 @@ pydantic==2.10.1
 uvicorn==0.32.1
 slowapi==0.1.9
 email-validator==2.2.0
-exchange_calendars==4.6
+exchange_calendars==4.7
 holidays==0.61