Bump apispec from 3.0.0 to 3.1.0 (#1074)

Bumps [apispec](https://github.com/marshmallow-code/apispec) from 3.0.0 to 3.1.0.
- [Release notes](https://github.com/marshmallow-code/apispec/releases)
- [Changelog](https://github.com/marshmallow-code/apispec/blob/dev/CHANGELOG.rst)
- [Commits](https://github.com/marshmallow-code/apispec/compare/3.0.0...3.1.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

http_service/requirements.txt

@@ -1,5 +1,5 @@
 apispec-webframeworks==0.5.0
-apispec[yaml]==3.0.0
+apispec[yaml]==3.1.0
 cerberus==1.3.2
 Flask==1.1.1
 flask-apispec==0.8.3