Bump pytest from 5.3.2 to 5.3.5 in /packages/service-library

Bumps [pytest](https://github.com/pytest-dev/pytest) from 5.3.2 to 5.3.5.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@5.3.2...5.3.5)

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

Author: dependabot-preview[bot]

packages/service-library/requirements/_test.txt

@@ -40,7 +40,7 @@ pytest-instafail==0.4.1.post0  # via -r requirements/_test.in (line 14)
 pytest-mock==2.0.0        # via -r requirements/_test.in (line 17)
 pytest-runner==5.2        # via -r requirements/_test.in (line 15)
 pytest-sugar==0.9.2       # via -r requirements/_test.in (line 18)
-pytest==5.3.2             # via -r requirements/_test.in (line 11), pytest-aiohttp, pytest-cov, pytest-instafail, pytest-mock, pytest-sugar
+pytest==5.3.5             # via -r requirements/_test.in (line 11), pytest-aiohttp, pytest-cov, pytest-instafail, pytest-mock, pytest-sugar
 pyyaml==5.3               # via -r requirements/_base.txt (line 23), openapi-spec-validator
 requests==2.22.0          # via coveralls
 six==1.12.0               # via -r requirements/_base.txt (line 24), astroid, isodate, jsonschema, openapi-core, openapi-spec-validator, packaging, pyrsistent, tenacity