Bump golang from 1.25-alpine to 1.26-alpine

Bumps golang from 1.25-alpine to 1.26-alpine.

---
updated-dependencies:
- dependency-name: golang
  dependency-version: 1.26-alpine
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.25-alpine as builder
+FROM golang:1.26-alpine as builder
 
 WORKDIR /app
 COPY go.* .