Bump prometheus-client from 0.7.1 to 0.8.0

Bumps [prometheus-client](https://github.com/prometheus/client_python) from 0.7.1 to 0.8.0.
- [Release notes](https://github.com/prometheus/client_python/releases)
- [Commits](prometheus/client_python@v0.7.1...v0.8.0)

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

Author: dependabot-preview[bot]

poetry.lock

@@ -16,7 +16,7 @@ flask = "1.1.2"
 Flask-Cors = "3.0.8"
 Flask-Limiter = "1.3.1"
 Flask-Migrate = "2.5.3"
-prometheus_client = "0.7.1"
+prometheus_client = "0.8.0"
 psycopg2-binary = "2.8.5"
 py-healthcheck = "1.10.1"
 pytest = "5.4.2"