Use public clone URL in Gitea workflow

.gitea/workflows/build-windows-exe.yml

@@ -11,7 +11,7 @@ jobs:
       - name: Checkout
         shell: bash
         run: |
-          git clone --depth 1 "$GITHUB_SERVER_URL/$GITHUB_REPOSITORY.git" .
+          git clone --depth 1 https://git.vrcworldtour.com/every_holiday/VRCWT-OSC.git .
 
       - name: Install Go
         shell: bash