Bump Gitea version to 1.15.8 (#270)

As title.

Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/270
Reviewed-by: techknowlogick <techknowlogick@gitea.io>
Reviewed-by: Gusted <gusted@noreply.gitea.io>
Co-authored-by: justusbunsi <justusbunsi@noreply.gitea.io>
Co-committed-by: justusbunsi <justusbunsi@noreply.gitea.io>

Chart.yaml

@@ -3,7 +3,7 @@ name: gitea
 description: Gitea Helm chart for Kubernetes
 type: application
 version: 0.0.0
-appVersion: 1.15.4
+appVersion: 1.15.8
 icon: https://docs.gitea.io/images/gitea.png
 
 keywords:

README.md

@@ -682,7 +682,7 @@ gitea:
 | Parameter          | Description                                                                               | Default       |
 | ------------------ | ----------------------------------------------------------------------------------------- | ------------- |
 | `image.repository` | Image to start for this pod                                                               | `gitea/gitea` |
-| `image.tag`        | [Image tag](https://hub.docker.com/r/gitea/gitea/tags?page=1&ordering=last_updated)       | `1.14.6`      |
+| `image.tag`        | [Image tag](https://hub.docker.com/r/gitea/gitea/tags?page=1&ordering=last_updated)       | `1.15.8`      |
 | `image.pullPolicy` | Image pull policy                                                                         | `Always`      |
 | `image.rootless`   | Wether or not to pull the rootless version of Gitea, only works on Gitea 1.14.x or higher | `false`       |
 

values.yaml

@@ -8,7 +8,7 @@ clusterDomain: cluster.local
 
 image:
   repository: gitea/gitea
-  tag: 1.15.4
+  tag: 1.15.8
   pullPolicy: Always
   rootless: false # only possible when running 1.14 or later