Use standard GitHub actions form Nim Template.

Author: treeform

.github/workflows/build.yml

@@ -10,9 +10,8 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v3
-    - uses: jiro4989/setup-nim-action@v1
+    - uses: actions/checkout@v5
+    - uses: jiro4989/setup-nim-action@v2
       with:
         repo-token: ${{ secrets.GITHUB_TOKEN }}
     - run: nimble test -y
-    - run: nimble test --gc:orc -y