Quote all Ruby version values

Author: andyundso

.github/workflows/ci.yml

@@ -55,7 +55,7 @@ jobs:
       fail-fast: false
       matrix:
         ruby-version:
-          - 2.7
+          - "2.7"
           - "3.0"
 
     name: Install on Windows (MingW)
@@ -96,7 +96,7 @@ jobs:
           - 2019
           - 2022
         ruby-version:
-          - 2.7
+          - "2.7"
           - "3.0"
 
     name: Test on Windows (MingW)
@@ -171,9 +171,9 @@ jobs:
       fail-fast: false
       matrix:
         ruby-version:
-          - 3.1
-          - 3.2
-          - 3.3
+          - "3.1"
+          - "3.2"
+          - "3.3"
 
     name: Install on Windows (UCRT)
     runs-on: windows-latest
@@ -213,9 +213,9 @@ jobs:
           - 2019
           - 2022
         ruby-version:
-          - 3.1
-          - 3.2
-          - 3.3
+          - "3.1"
+          - "3.2"
+          - "3.3"
     name: Test on Windows (UCRT)
     runs-on: windows-latest
     steps:
@@ -286,11 +286,11 @@ jobs:
       fail-fast: false
       matrix:
         ruby-version:
-          - 2.7
+          - "2.7"
           - "3.0"
-          - 3.1
-          - 3.2
-          - 3.3
+          - "3.1"
+          - "3.2"
+          - "3.3"
 
     name: Install on Windows (Native)
     runs-on: windows-latest
@@ -350,11 +350,11 @@ jobs:
           - 2019
           - 2022
         ruby-version:
-          - 2.7
+          - "2.7"
           - "3.0"
-          - 3.1
-          - 3.2
-          - 3.3
+          - "3.1"
+          - "3.2"
+          - "3.3"
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -414,11 +414,11 @@ jobs:
       fail-fast: false
       matrix:
         ruby-version:
-          - 2.7
+          - "2.7"
           - "3.0"
-          - 3.1
-          - 3.2
-          - 3.3
+          - "3.1"
+          - "3.2"
+          - "3.3"
 
     name: Install on Mac OS (M1)
     runs-on: macos-14