Bump s3transfer from 0.3.6 to 0.3.7

Bumps [s3transfer](https://github.com/boto/s3transfer) from 0.3.6 to 0.3.7.
- [Release notes](https://github.com/boto/s3transfer/releases)
- [Changelog](https://github.com/boto/s3transfer/blob/develop/CHANGELOG.rst)
- [Commits](boto/s3transfer@0.3.6...0.3.7)

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

requirements.txt

@@ -35,7 +35,7 @@ python-dateutil==2.8.1
 repoze.sendmail==4.4.1
 requests==2.25.1
 requests-hawk==1.1.0
-s3transfer==0.3.6
+s3transfer==0.3.7
 six==1.15.0
 transaction==3.0.1
 translationstring==1.4