.github/workflows: use 1.22, drop 1.18

For #3171

Change-Id: Icd0111a67e4d11c97cdc79cd83a6a17dd4933f1b
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/563361
Reviewed-by: Robert Findley <rfindley@google.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Commit-Queue: Hyang-Ah Hana Kim <hyangah@gmail.com>

Author: hyangah

.github/workflows/test-long-all.yml

@@ -17,7 +17,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
         version: ['stable', 'insiders']
-        go: ['1.18', '1.19', '1.20', '1.21']
+        go: ['1.19', '1.20', '1.21', '1.22']
 
     steps:
       - name: Clone repository

.github/workflows/test-long.yml

@@ -16,7 +16,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest] # TODO: reenable macos-latest
         version: ['stable']
-        go: ['1.18', '1.19', '1.20', '1.21']
+        go: ['1.19', '1.20', '1.21', '1.22']
 
     steps:
       - name: Clone repository

.github/workflows/test-smoke.yml

@@ -31,7 +31,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v4
         with:
-         go-version: '1.21'
+         go-version: '1.22'
          check-latest: true
          cache: true
 

.github/workflows/wiki.yml

@@ -35,7 +35,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v4
         with:
-          go-version: '1.21'
+          go-version: '1.22'
           check-latest: true
           cache: true
           cache-dependency-path: '**/go.sum'