Bump pytest-mock from 3.1.0 to 3.1.1 in /packages/service-library (#1545)

Bumps [pytest-mock](https://github.com/pytest-dev/pytest-mock) from 3.1.0 to 3.1.1.
- [Release notes](https://github.com/pytest-dev/pytest-mock/releases)
- [Changelog](https://github.com/pytest-dev/pytest-mock/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-mock@v3.1.0...v3.1.1)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Pedro Crespo <[email protected]>

Author: dependabot-preview[bot]

packages/service-library/requirements/_test.txt

@@ -16,7 +16,9 @@ chardet==3.0.4            # via -r requirements/_base.txt, aiohttp, requests
 coverage==5.1             # via -r requirements/_test.in, coveralls, pytest-cov
 coveralls==2.0.0          # via -r requirements/_test.in
 docopt==0.6.2             # via coveralls
-idna==2.9                 # via -r requirements/_base.txt, requests, yarl
+idna-ssl==1.1.0           # via -r requirements/_base.txt
+idna==2.9                 # via -r requirements/_base.txt, idna-ssl, requests, yarl
+importlib-metadata==1.6.0  # via -r requirements/_base.txt
 isodate==0.6.0            # via -r requirements/_base.txt, openapi-core
 isort==4.3.21             # via pylint
 jsonschema==3.2.0         # via -r requirements/_base.txt, openapi-spec-validator
@@ -38,7 +40,7 @@ pytest-aiohttp==0.3.0     # via -r requirements/_test.in
 pytest-cov==2.9.0         # via -r requirements/_test.in
 pytest-docker==0.7.2      # via -r requirements/_test.in
 pytest-instafail==0.4.1.post0  # via -r requirements/_test.in
-pytest-mock==3.1.0        # via -r requirements/_test.in
+pytest-mock==3.1.1        # via -r requirements/_test.in
 pytest-runner==5.2        # via -r requirements/_test.in
 pytest-sugar==0.9.3       # via -r requirements/_test.in
 pytest==5.4.3             # via -r requirements/_test.in, pytest-aiohttp, pytest-cov, pytest-instafail, pytest-mock, pytest-sugar