(CAT-2051): Replaced centos-7 with rhel-7

Author: span786

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
-      matrix: {'platform':['centos-7'],'collection':['puppet7-nightly', 'puppet8-nightly']}
+      matrix: {'platform':['rhel-7'],'collection':['puppet7-nightly', 'puppet8-nightly']}
 
     steps:
     - name: Checkout Source

.github/workflows/nightly.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
-      matrix: {'platform':['centos-7'],'collection':['puppet7-nightly', 'puppet8-nightly']}
+      matrix: {'platform':['rhel-7'],'collection':['puppet7-nightly', 'puppet8-nightly']}
 
     steps:
     - name: Checkout Source