chore(docker): bump dev go version to 1.20.2 (#2021)

Signed-off-by: xjasonlyu <xjasonlyu@gmail.com>

deploy/docker/Dockerfile-dev

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-ARG GO_VERSION=1.18.5
+ARG GO_VERSION=1.20.2
 FROM ghcr.io/lf-edge/ekuiper/base:$GO_VERSION-debian AS builder
 
 COPY . /go/kuiper