chore: upgrade base image go version to 1.18

Signed-off-by: Jiyong Huang <huangjy@emqx.io>

.github/dockerfile/Dockerfile.centos

@@ -16,7 +16,7 @@ FROM centos:7
 
 RUN yum install -y make wget git which rpm-build gcc
 
-ARG GO_VERSION=1.17.9
+ARG GO_VERSION=1.18
 
 RUN case $(arch) in \
         x86_64) \

.github/dockerfile/Dockerfile.debian

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-ARG GO_VERSION=1.17.9
+ARG GO_VERSION=1.18
 FROM golang:${GO_VERSION} AS builder
 
 COPY . /go/kuiper