Bump coverage from 5.2 to 5.2.1 in /packages/service-library (#1650)

Bumps [coverage](https://github.com/nedbat/coveragepy) from 5.2 to 5.2.1.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@coverage-5.2...coverage-5.2.1)

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

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

Author: dependabot-preview[bot]

packages/service-library/requirements/_test.txt

@@ -16,17 +16,17 @@ cached-property==1.5.1    # via docker-compose
 certifi==2020.6.20        # via requests
 cffi==1.14.1              # via bcrypt, cryptography, pynacl
 chardet==3.0.4            # via -r requirements/_base.txt, aiohttp, requests
-coverage==5.2             # via -r requirements/_test.in, coveralls, pytest-cov
+coverage==5.2.1           # via -r requirements/_test.in, coveralls, pytest-cov
 coveralls==2.1.1          # via -r requirements/_test.in
 cryptography==3.0         # via paramiko
 distro==1.5.0             # via docker-compose
 docker-compose==1.26.2    # via pytest-docker
 docker[ssh]==4.2.2        # via docker-compose
 dockerpty==0.4.1          # via docker-compose
 docopt==0.6.2             # via coveralls, docker-compose
-idna-ssl==1.1.0           # via -r requirements/_base.txt, aiohttp
+idna-ssl==1.1.0           # via -r requirements/_base.txt
 idna==2.9                 # via -r requirements/_base.txt, idna-ssl, requests, yarl
-importlib-metadata==1.7.0  # via -r requirements/_base.txt, jsonschema, pluggy, pytest
+importlib-metadata==1.7.0  # 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, docker-compose, openapi-spec-validator
@@ -66,8 +66,7 @@ termcolor==1.1.0          # via pytest-sugar
 texttable==1.6.2          # via docker-compose
 toml==0.10.1              # via pylint
 trafaret==2.0.2           # via -r requirements/_base.txt
-typed-ast==1.4.1          # via astroid
-typing-extensions==3.7.4.2  # via -r requirements/_base.txt, aiohttp
+typing-extensions==3.7.4.2  # via -r requirements/_base.txt
 ujson==3.1.0              # via -r requirements/_base.txt
 urllib3==1.25.9           # via requests
 wcwidth==0.2.5            # via pytest