CI: bump actions/setup-go to v6 & use go version in go.mod (#3510)

Author: Loyalsoldier

.github/workflows/linter.yml

@@ -19,14 +19,15 @@ jobs:
     if: github.repository == 'v2fly/v2ray-core'
     runs-on: ubuntu-latest
     steps:
-      - name: Set up Go 1.x
-        uses: actions/setup-go@v4
-        with:
-          go-version: ^1.21
-
       - name: Checkout codebase
         uses: actions/checkout@v5
 
+      - name: Set up Go
+        uses: actions/setup-go@v6
+        with:
+          go-version-file: ./go.mod
+          cache-dependency-path: ./go.sum
+
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v8
         with:

.github/workflows/release.yml

@@ -133,9 +133,10 @@ jobs:
           echo "ASSET_NAME=$_NAME" >> $GITHUB_ENV
 
       - name: Set up Go
-        uses: actions/setup-go@v4
+        uses: actions/setup-go@v6
         with:
-          go-version: ^1.24
+          go-version-file: ./go.mod
+          cache-dependency-path: ./go.sum
 
       - name: Get project dependencies
         run: go mod download
@@ -213,9 +214,10 @@ jobs:
           fetch-depth: 0
 
       - name: Set up Go
-        uses: actions/setup-go@v4
+        uses: actions/setup-go@v6
         with:
-          go-version: ^1.24
+          go-version-file: ./go.mod
+          cache-dependency-path: ./go.sum
 
       - uses: actions/download-artifact@v5
         with:

.github/workflows/test.yml

@@ -27,16 +27,17 @@ jobs:
       matrix:
         os: [windows-latest, ubuntu-latest, macos-latest]
     steps:
-      - name: Set up Go 1.x
-        uses: actions/setup-go@v4
-        with:
-          go-version: ^1.21
-
       - name: Checkout codebase
         uses: actions/checkout@v5
         with:
           fetch-depth: 0
 
+      - name: Set up Go
+        uses: actions/setup-go@v6
+        with:
+          go-version-file: ./go.mod
+          cache-dependency-path: ./go.sum
+
       - name: Check Go modules
         run: |
           go mod tidy