Fixed a double quote mistake

Author: noborus

.github/workflows/release.yml

@@ -18,7 +18,7 @@ jobs:
     - name: Set environment variables
       shell: bash
       run: |
-        echo "GOPATH=${{ runner.workspace }}""  >> $GITHUB_ENV
+        echo "GOPATH=${{ runner.workspace }}" >> $GITHUB_ENV
         echo "${{ runner.workspace }}/bin" >> $GITHUB_PATH
     - name: Setup XGO
       run: go get github.com/crazy-max/xgo