build(deps): Bump boto3 from 1.19.4 to 1.19.7

Bumps [boto3](https://github.com/boto/boto3) from 1.19.4 to 1.19.7.
- [Release notes](https://github.com/boto/boto3/releases)
- [Changelog](https://github.com/boto/boto3/blob/develop/CHANGELOG.rst)
- [Commits](boto/boto3@1.19.4...1.19.7)

---
updated-dependencies:
- dependency-name: boto3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements/base.txt

@@ -55,7 +55,7 @@ gitpython==3.1.24
 django-background-tasks==1.2.5
 
 # S3 Uploads
-boto3==1.19.4
+boto3==1.19.7
 django-storages==1.12.2  # https://github.com/jschneier/django-storages
 
 # Python function to stream unzip all the files in a ZIP archive, without loading the entire ZIP file into memory or any of its uncompressed files.