Bump requests-mock from 1.7.0 to 1.8.0

Bumps [requests-mock](https://github.com/jamielennox/requests-mock) from 1.7.0 to 1.8.0.
- [Release notes](https://github.com/jamielennox/requests-mock/releases)
- [Commits](jamielennox/requests-mock@1.7.0...1.8.0)

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

Author: dependabot-preview[bot]

requirements.txt

@@ -5,7 +5,7 @@ Jinja2==2.10.1
 mock==4.0.2
 pytest==5.4.2
 requests==2.23.0
-requests-mock==1.7.0
+requests-mock==1.8.0
 pytest-cov==2.7.1
 codecov==2.0.16
 botocore>=1.12.130