chore(deps): update alpine docker tag to v3.18 (#372)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gwy/templates/Dockerfile.tmpl

@@ -1,6 +1,6 @@
 # Template for grpc-gateway 
 
-ARG alpine_version=3.17
+ARG alpine_version=3.18
 ARG go_version=1.19
 FROM golang:$go_version-alpine$alpine_version AS build