fix(deps): update dependency prometheus-client to ~=0.21.0

Signed-off-by: red-hat-konflux <126015336+red-hat-konflux[bot]@users.noreply.github.com>

pyproject.toml

@@ -20,7 +20,7 @@ requests = "~=2.32.2"
 insights-core = "~=3.4.0"
 pydash = "~=6.0.0"
 app-common-python = "~=0.2.5"
-prometheus-client = "~=0.11.0"
+prometheus-client = "~=0.21.0"
 prometheus-flask-exporter = "~=0.23.1"
 pyyaml = "*"
 watchtower = ">=1.0.0"