Bump golang from 1.24.11 to 1.26.1 in /cmd/sidecar_mounter

Bumps golang from 1.24.11 to 1.26.1.

---
updated-dependencies:
- dependency-name: golang
  dependency-version: 1.26.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

cmd/sidecar_mounter/Dockerfile

@@ -14,7 +14,7 @@
 # limitations under the License.
 
 # Build sidecar-mounter go binary
-FROM --platform=$BUILDPLATFORM golang:1.24.11 AS sidecar-mounter-builder
+FROM --platform=$BUILDPLATFORM golang:1.26.1 AS sidecar-mounter-builder
 
 ARG STAGINGVERSION
 ARG TARGETPLATFORM