Bump coverage from 4.5.1 to 5.0.3 in /packages/service-library

Bumps [coverage](https://github.com/nedbat/coveragepy) from 4.5.1 to 5.0.3.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@coverage-4.5.1...coverage-5.0.3)

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

Author: dependabot-preview[bot]

packages/service-library/requirements/_test.in

@@ -6,7 +6,7 @@
 -r _base.txt
 
 # testing
-coverage==4.5.1 # TODO: Downgraded because of a bug https://github.com/nedbat/coveragepy/issues/716
+coverage==5.0.3 # TODO: Downgraded because of a bug https://github.com/nedbat/coveragepy/issues/716
 
 pytest
 pytest-aiohttp  # incompatible with pytest-asyncio. See https://github.com/pytest-dev/pytest-asyncio/issues/76

packages/service-library/requirements/_test.txt

@@ -12,7 +12,7 @@ async-timeout==3.0.1      # via -r requirements/_base.txt (line 10), aiohttp
 attrs==19.3.0             # via -r requirements/_base.txt (line 11), aiohttp, jsonschema, openapi-core, pytest, pytest-docker
 certifi==2019.11.28       # via requests
 chardet==3.0.4            # via -r requirements/_base.txt (line 12), aiohttp, requests
-coverage==4.5.1           # via -r requirements/_test.in (line 9), coveralls, pytest-cov
+coverage==5.0.3           # via -r requirements/_test.in (line 9), coveralls, pytest-cov
 coveralls==1.10.0         # via -r requirements/_test.in (line 22)
 docopt==0.6.2             # via coveralls
 idna==2.8                 # via -r requirements/_base.txt (line 13), requests, yarl