Upgrade checkout workflows (#3241)

Summary:
Pull Request resolved: https://github.com/facebook/flipper/pull/3241

Fixes https://github.com/facebook/flipper/issues/3196

Reviewed By: lawrencelomax

Differential Revision: D33403962

fbshipit-source-id: 3f282e5bd10fc25f72cac58fa97f026e00a87dae

.github/workflows/android-sample.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
     - name: set up JDK
       uses: actions/setup-java@v1
       with:

.github/workflows/nodejs-doctor.yml

@@ -11,7 +11,7 @@ jobs:
       doctor-directory: ./desktop/doctor
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
     - uses: actions/setup-node@v1
       with:
         node-version: '14.x'

.github/workflows/nodejs-pkg.yml

@@ -11,7 +11,7 @@ jobs:
       pkg-directory: ./desktop/pkg
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
     - uses: actions/setup-node@v1
       with:
         node-version: '14.x'