chore(deps): update golang docker tag to v1.20.4 (#370)

Signed-off-by: Renovate Bot <bot@renovateapp.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Alex Jones <alexsimonjones@gmail.com>

container/Dockerfile

@@ -9,7 +9,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM golang:1.20.3-alpine3.16 AS builder
+FROM golang:1.20.4-alpine3.16 AS builder
 
 ENV CGO_ENABLED=0