Revert update to actions/checkout requirement to v2.3.4 (kedacore#1362)

Signed-off-by: Tom Kerkhove <kerkhove.tom@gmail.com>

.github/workflows/build-tools.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out code
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v1
         with:
           fetch-depth: 1
 

.github/workflows/fossa.yml

@@ -11,7 +11,7 @@ jobs:
     # build-tools is built from ../../tools/build-tools.Dockerfile
     container: kedacore/build-tools:main
     steps:
-      - uses: actions/checkout@v2.3.4
+      - uses: actions/checkout@v1
       - uses: actions/setup-go@v2
         with:
           go-version: "^1.15.3"

.github/workflows/main-build.yml

@@ -11,7 +11,7 @@ jobs:
     container: kedacore/build-tools:main
     steps:
       - name: Check out code
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v1
         with:
           fetch-depth: 1
 

.github/workflows/nightly-e2e.yml

@@ -10,7 +10,7 @@ jobs:
     container: kedacore/build-tools:main
     steps:
       - name: Check out code
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v1
         with:
           fetch-depth: 1
 

.github/workflows/pr-validation.yml

@@ -11,7 +11,7 @@ jobs:
     container: kedacore/build-tools:main
     steps:
       - name: Check out code
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v1
         with:
           fetch-depth: 1
 
@@ -36,7 +36,7 @@ jobs:
     name: Static Checks
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.4
+      - uses: actions/checkout@v1
       - uses: actions/setup-python@v2.1.4
       - uses: actions/setup-go@v2
         with:
@@ -57,7 +57,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2.3.4
+      uses: actions/checkout@v1
       with:
         # We must fetch at least the immediate parents so that if this is
         # a pull request then we can checkout the head.

.github/workflows/release-build.yml

@@ -11,7 +11,7 @@ jobs:
     container: kedacore/build-tools:main
     steps:
       - name: Check out code
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v1
         with:
           fetch-depth: 1
 

.github/workflows/v1-build.yml

@@ -11,7 +11,7 @@ jobs:
     container: kedacore/build-tools:v1
     steps:
       - name: Check out code
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v1
         with:
           fetch-depth: 1