chore(deps): update container image fireflyiii/core to vversion-6.1.15@3d10369 by renovate (#21227)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [fireflyiii/core](https://togithub.com/firefly-iii/docker)
([source](https://dev.azure.com/Firefly-III/_git/MainImage)) | patch |
`version-6.1.14` -> `version-6.1.15` |

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This PR has been generated by [Renovate
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<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy4zMTkuMSIsInVwZGF0ZWRJblZlciI6IjM3LjMxOS4xIiwidGFyZ2V0QnJhbmNoIjoibWFzdGVyIiwibGFiZWxzIjpbImF1dG9tZXJnZSIsInVwZGF0ZS9kb2NrZXIvZ2VuZXJhbC9ub24tbWFqb3IiXX0=-->

charts/stable/fireflyiii/Chart.yaml

@@ -7,7 +7,7 @@ annotations:
   truecharts.org/min_helm_version: "3.11"
   truecharts.org/train: stable
 apiVersion: v2
-appVersion: 6.1.14
+appVersion: 6.1.15
 dependencies:
   - name: common
     version: 20.3.11
@@ -41,4 +41,4 @@ sources:
   - https://github.com/truecharts/charts/tree/master/charts/stable/fireflyiii
   - https://hub.docker.com/r/fireflyiii/core
 type: application
-version: 25.10.20
+version: 25.10.21

charts/stable/fireflyiii/values.yaml

@@ -1,7 +1,7 @@
 image:
   repository: fireflyiii/core
   pullPolicy: IfNotPresent
-  tag: version-6.1.14@sha256:9c69f00c3325cfc4ef667a78042c49ec614c5d3637d071522c6d2dc0285d8946
+  tag: version-6.1.15@sha256:3d10369ee9d6c1991b0b5355cc03d163b510c86c86d2aa9fa0370a2cf6d66687
 securityContext:
   container:
     readOnlyRootFilesystem: false