Merge pull request #1601 from goplus/xgopilot/issue-1600-1770091111

ci: reduce Go matrix to representative versions

Author: xushiwei

.github/workflows/llgo.yml

@@ -43,7 +43,7 @@ jobs:
           - macos-latest
           - ubuntu-latest
         llvm: [19]
-        go: ["1.21.13", "1.22.12", "1.23.6", "1.24.2"]
+        go: ["1.21.13", "1.24.2"]
     runs-on: ${{matrix.os}}
     steps:
       - uses: actions/checkout@v6
@@ -217,7 +217,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest]
         llvm: [19]
-        go: ["1.21.13", "1.22.12", "1.23.6", "1.24.2"]
+        go: ["1.21.13", "1.24.2"]
     runs-on: ${{matrix.os}}
     steps:
       - uses: actions/checkout@v6