Update prometheus-mixin to monitoring-mixins-v1.6.0 (#619)

Signed-off-by: Nicolas Lamirault <nlamirault@users.noreply.github.com>
Co-authored-by: Nicolas Lamirault <nlamirault@users.noreply.github.com>

charts/prometheus-mixin/Chart.yaml

@@ -31,12 +31,12 @@ keywords:
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 1.3.0
+version: 1.4.0
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application. Versions are not expected to
 # follow Semantic Versioning. They should reflect the version the application is using.
-appVersion: 2.31.1
+appVersion: 2.48.0
 
 maintainers:
   - name: nlamirault
@@ -60,4 +60,4 @@ annotations:
     url: https://keybase.io/nlamirault/pgp_keys.asc
   artifacthub.io/changes: |
     - kind: changed
-      description: prometheus-mixin v2.47.2
+      description: prometheus-mixin v2.48.0