Update rest of dockerfiles

Author: thepetk

index/server/Dockerfile

@@ -14,7 +14,7 @@
 # limitations under the License.
 
 # Index Server build stage
-FROM golang:1.19-alpine@sha256:276692412aea6f9dd6cdc5725b2f1c05bef8df7223811afbc6aa16294e2903f9 AS index-builder
+FROM golang:1.21-alpine@sha256:3f8e3ad3e7c128d29ac3004ac8314967c5ddbfa5bfa7caa59b0de493fc01686a AS index-builder
 WORKDIR /tools
 COPY . .
 RUN CGO_ENABLED=0 go build -mod=vendor -o index-server main.go

tests/integration/Dockerfile

@@ -12,7 +12,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-FROM golang:1.19-alpine@sha256:276692412aea6f9dd6cdc5725b2f1c05bef8df7223811afbc6aa16294e2903f9
+FROM golang:1.21-alpine@sha256:3f8e3ad3e7c128d29ac3004ac8314967c5ddbfa5bfa7caa59b0de493fc01686a
 
 WORKDIR /registry-test