Bump httplib2 from 0.18.1 to 0.19.0

Bumps [httplib2](https://github.com/httplib2/httplib2) from 0.18.1 to 0.19.0.
- [Release notes](https://github.com/httplib2/httplib2/releases)
- [Changelog](https://github.com/httplib2/httplib2/blob/master/CHANGELOG)
- [Commits](httplib2/httplib2@v0.18.1...v0.19.0)

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

requirements.txt

@@ -55,7 +55,7 @@ google-api-core==1.22.0
 google-auth==1.19.2
 google-auth-httplib2==0.0.4
 googleapis-common-protos==1.52.0
-httplib2==0.18.1
+httplib2==0.19.0
 idna==2.8
 imagesize==1.2.0
 importlib-metadata==1.7.0