Bump golang from 1.24 to 1.25 in /images/helm-operator

Bumps golang from 1.24 to 1.25.

---
updated-dependencies:
- dependency-name: golang
  dependency-version: '1.25'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

images/helm-operator/Dockerfile

@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM --platform=$BUILDPLATFORM golang:1.24 AS builder
+FROM --platform=$BUILDPLATFORM golang:1.25 AS builder
 ARG TARGETARCH
 
 WORKDIR /workspace