ci: Update ruby matrix (#189)

Signed-off-by: GitHub <[email protected]>
Co-authored-by: chizhg <[email protected]>
Co-authored-by: Jeremy Fehr <[email protected]>

Author: chizhg

.github/workflows/conformance.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: ["2.6", "2.7", "3.0", "3.1", "3.2"]
+        ruby: ['2.6', '2.7', '3.0', '3.1', '3.2', '3.3']
     steps:
     - name: Harden Runner
       uses: step-security/harden-runner@8ca2b8b2ece13480cda6dacd3511b49857a23c09 # v2.5.1

.github/workflows/unit.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        ruby: ["2.6", "2.7", "3.0", "3.1", "3.2"]
+        ruby: ['2.6', '2.7', '3.0', '3.1', '3.2', '3.3']
         flags: ["--only --test-unit"]
         include:
           - os: ubuntu-latest