Upgrade CI ruby version

Author: 0x2c7

.github/workflows/rspec.yml

@@ -38,7 +38,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.5, 2.6, 2.7.1, head]
+        ruby: [2.5, 2.6, 2.7.2, head]
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
@@ -73,7 +73,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.5, 2.6, 2.7.1, head]
+        ruby: [2.5, 2.6, 2.7.2, head]
     env:
       CI_PLATFORM: "macos"
     runs-on: macos-latest