chore(deps): update golang:1.25.0 docker digest to 91e2cd4 (#215)

Co-authored-by: Renovate Bot <[email protected]>

Author: jheuel

Dockerfile

@@ -7,7 +7,7 @@ RUN deno install
 RUN deno task build
 
 # Stage 2: Build the Go backend
-FROM golang:1.25.0@sha256:9e56f0d0f043a68bb8c47c819e47dc29f6e8f5129b8885bed9d43f058f7f3ed6 as backend-builder
+FROM golang:1.25.0@sha256:91e2cd436f7adbfad0a0cbb7bf8502fa863ed8461414ceebe36c6304731e0fd9 as backend-builder
 
 WORKDIR /app/backend
 COPY ./backend .