Bump actions/checkout from v1 to v2.3.1 (#40)

Bumps [actions/checkout](https://github.com/actions/checkout) from v1 to v2.3.1.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v1...28c7f3d)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/nodejs.yml

@@ -11,7 +11,7 @@ jobs:
         node-version: [10.x, 12.x, 14.x]
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2.3.1
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v1
       with:

.github/workflows/npmpublish.yml

@@ -8,7 +8,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2.3.1
       - uses: actions/setup-node@v1
         with:
           node-version: 12
@@ -19,7 +19,7 @@ jobs:
     needs: build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2.3.1
       - uses: actions/setup-node@v1
         with:
           node-version: 12