chore(deps): update golang:1.21 docker digest to 4d5cf6c

Author: ur-renovate

Dockerfile

@@ -14,7 +14,7 @@
 # limitations under the License.
 
 # Specify the version of Go to use
-FROM golang:1.21@sha256:19600fdcae402165dcdab18cb9649540bde6be7274dedb5d205b2f84029fe909 as builder
+FROM golang:1.21@sha256:4d5cf6cb9269c5867ccf86b8282897b7eb4764d9739b1a19d8cc68643bbc3f3c as builder
 
 RUN apt-get update && apt-get install -y xz-utils && rm -rf /var/lib/apt/lists/*