use go.mod file in Dgraph repo for go version

Author: mangalaman93

.github/workflows/cd-dgraph-js.yml

@@ -35,16 +35,10 @@ jobs:
         path: dgraph
         repository: dgraph-io/dgraph
         ref: main
-    - name: Get Go Version
-      run: |
-        #!/bin/bash
-        cd dgraph
-        GOVERSION=$({ [ -f .go-version ] && cat .go-version; })
-        echo "GOVERSION=$GOVERSION" >> $GITHUB_ENV
     - name: Set up Go
-      uses: actions/setup-go@v5
-      with:
-        go-version: ${{ env.GOVERSION }}
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
     - name: Build dgraph binary
       run: cd dgraph && make docker-image # also builds dgraph binary
     - name: Move dgraph binary to gopath

.github/workflows/ci-dgraph-js.yml

@@ -39,17 +39,10 @@ jobs:
         path: dgraph
         repository: dgraph-io/dgraph
         ref: main
-    - name: Get Go Version
-      run: |
-        #!/bin/bash
-        cd dgraph
-        GOVERSION=$({ [ -f .go-version ] && cat .go-version; })
-        echo "GOVERSION=$GOVERSION" >> $GITHUB_ENV
     - name: Set up Go
-      uses: actions/setup-go@v5
-      with:
-        go-version: ${{ env.GOVERSION }}
-        cache: false
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
     - name: Build dgraph binary
       run: cd dgraph && make docker-image # also builds dgraph binary
     - name: Move dgraph binary to gopath