Bump drf-yasg from 1.21.5 to 1.21.7

Bumps [drf-yasg](https://github.com/axnsan12/drf-yasg) from 1.21.5 to 1.21.7.
- [Release notes](https://github.com/axnsan12/drf-yasg/releases)
- [Changelog](https://github.com/axnsan12/drf-yasg/blob/master/docs/changelog.rst)
- [Commits](axnsan12/drf-yasg@1.21.5...1.21.7)

---
updated-dependencies:
- dependency-name: drf-yasg
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements.txt

@@ -176,7 +176,7 @@ drf-dynamic-fields==0.4.0
     # via geotrek (setup.py)
 drf-extensions==0.7.1
     # via geotrek (setup.py)
-drf-yasg==1.21.5
+drf-yasg==1.21.7
     # via
     #   django-large-image
     #   geotrek (setup.py)