build(deps): bump golang from 1.21rc4-alpine to 1.21-alpine (#853)

Bumps golang from 1.21rc4-alpine to 1.21-alpine.

---
updated-dependencies:
- dependency-name: golang
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Dockerfile

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM golang:1.21rc4-alpine AS build
+FROM golang:1.21-alpine AS build
 RUN apk update
 RUN apk upgrade
 RUN apk add --update gcc g++