deps: Bump Go and golangci-lint

* Go to 1.15.5
* golangci-lint 1.33.0

Signed-off-by: Chris Crone <[email protected]>

Dockerfile

@@ -15,8 +15,8 @@
 #   See the License for the specific language governing permissions and
 #   limitations under the License.
 
-ARG GO_VERSION=1.15.3-alpine
-ARG GOLANGCI_LINT_VERSION=v1.32.0-alpine
+ARG GO_VERSION=1.15.5-alpine
+ARG GOLANGCI_LINT_VERSION=v1.33.0-alpine
 ARG PROTOC_GEN_GO_VERSION=v1.4.3
 
 FROM --platform=${BUILDPLATFORM} golang:${GO_VERSION} AS base