chore(deps): update golang docker tag to v1.25 (#48)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| golang | stage | minor | `1.24-alpine` -> `1.25-alpine` |

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### Configuration

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Co-authored-by: Timo Behrendt <t.behrendt@t00n.de>
Reviewed-on: #48
Reviewed-by: branch-buddy <branch-buddy@t00n.de>
Co-authored-by: Renovate Bot <renovate@t00n.de>
Co-committed-by: Renovate Bot <renovate@t00n.de>

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.24-alpine as build
+FROM golang:1.25-alpine as build
 
 ARG GOARCH=amd64