build(deps): bump watchfiles from 0.19.0 to 0.20.0 in /requirements

Bumps [watchfiles](https://github.com/samuelcolvin/watchfiles) from 0.19.0 to 0.20.0.
- [Release notes](https://github.com/samuelcolvin/watchfiles/releases)
- [Commits](samuelcolvin/watchfiles@v0.19.0...v0.20.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

requirements/requirements-dev.txt

@@ -205,7 +205,7 @@ urllib3==2.0.3
     # via
     #   requests
     #   sentry-sdk
-watchfiles==0.19.0
+watchfiles==0.20.0
     # via -r requirements.txt
 werkzeug==2.3.6
     # via

requirements/requirements.txt

@@ -85,7 +85,7 @@ typing-extensions==4.6.3
     # via -r requirements.in
 ujson==5.8.0
     # via -r requirements.in
-watchfiles==0.19.0
+watchfiles==0.20.0
     # via -r requirements.in
 xxhash==3.3.0
     # via -r requirements.in