Bump golang from 1.23.0 to 1.23.1 in /internal/test/e2e/gin

Bumps golang from 1.23.0 to 1.23.1.

---
updated-dependencies:
- dependency-name: golang
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

internal/test/e2e/gin/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.23.0
+FROM golang:1.23.1
 WORKDIR /sample-app
 COPY . .
 RUN go build -o main