chore(deps): update gomods/athens docker tag to v0.15.4

.drone.yml

@@ -17,7 +17,7 @@ steps:
 - name: helm lint
   commands:
   - helm lint
-  image: git.cryptic.systems/volker.raschek/helm:3.16.3
+  image: git.cryptic.systems/volker.raschek/helm:3.16.4
   resources:
     limits:
       cpu: 150
@@ -35,7 +35,7 @@ steps:
 - name: helm template
   commands:
   - helm template .
-  image: git.cryptic.systems/volker.raschek/helm:3.16.3
+  image: git.cryptic.systems/volker.raschek/helm:3.16.4
   resources:
     limits:
       cpu: 150
@@ -93,7 +93,7 @@ steps:
       from_secret: helm_repo_password
     HELM_REPO_USERNAME:
       from_secret: helm_repo_username
-  image: git.cryptic.systems/volker.raschek/helm:3.16.3
+  image: git.cryptic.systems/volker.raschek/helm:3.16.4
   resources:
     limits:
       cpu: 150

Chart.yaml

@@ -3,7 +3,7 @@ name: athens-proxy
 description: Athens proxy server for golang
 type: application
 version: "0.1.0"
-appVersion: "v0.15.1"
+appVersion: "v0.15.4"
 icon: https://github.com/gomods/athens/blob/main/docs/static/banner.png?raw=true
 
 keywords: