Add ruby-3.3 to CI (#1340)

Author: VitaliySerov

.github/workflows/build.yml

@@ -11,6 +11,7 @@ jobs:
         include:
           # Ruby 3.x on Ubuntu 22.04 LTS (latest at this time)
           - {os: ubuntu-22.04, ruby: 'head', db: mysql80}
+          - {os: ubuntu-22.04, ruby: '3.3', db: mysql80}
           - {os: ubuntu-22.04, ruby: '3.2', db: mysql80}
           - {os: ubuntu-22.04, ruby: '3.1', db: mysql80}
           - {os: ubuntu-22.04, ruby: '3.0', db: mysql80}