CI: pin xgo and go to v1.18.7 (#1439)

.woodpecker/binaries.yml

@@ -3,7 +3,7 @@ depends_on:
   - web
 
 variables:
-  - &golang_image 'golang:1.18'
+  - &golang_image 'golang:1.18.7'
   - &node_image 'node:18-alpine'
   - &when_path
       # related config files

.woodpecker/docker.yml

@@ -3,10 +3,10 @@ depends_on:
   - web
 
 variables:
-  - &golang_image 'golang:1.18'
+  - &golang_image 'golang:1.18.7'
   - &node_image 'node:18-alpine'
-  - &xgo_image 'techknowlogick/xgo:go-1.18.x'
-  - &xgo_version 'go-1.18.x'
+  - &xgo_image 'techknowlogick/xgo:go-1.18.7'
+  - &xgo_version 'go-1.18.7'
   - &platforms_release 'linux/arm/v6,linux/arm/v7,linux/arm64/v8,linux/386,linux/amd64,linux/ppc64le,linux/riscv64,linux/s390x,windows/amd64,freebsd/arm64,freebsd/amd64,openbsd/arm64,openbsd/amd64'
   - &platforms_server 'linux/arm/v7,linux/arm64/v8,linux/amd64,linux/ppc64le,linux/riscv64'
   - &platforms_preview 'linux/arm/v6,linux/arm64/v8,linux/amd64,linux/riscv64,windows/amd64'

.woodpecker/docs.yml

@@ -1,5 +1,5 @@
 variables:
-  - &golang_image 'golang:1.18'
+  - &golang_image 'golang:1.18.7'
   - &node_image 'node:18-alpine'
   - &when_path
     - "docs/**"

.woodpecker/test.yml

@@ -1,6 +1,5 @@
 variables:
-  - &golang_image 'golang:1.18'
-  - &node_image 'node:18-alpine'
+  - &golang_image 'golang:1.18.7'
   - &when_path
       # related config files
       - ".woodpecker/test.yml"