[CONJ-797] autodetection connection collation set to utf8mb4 equivale…

…nt collation for server configured to use UTF8mb3 collation

src/main/java/org/mariadb/jdbc/internal/protocol/AbstractConnectProtocol.java

@@ -1200,10 +1200,28 @@ private byte decideLanguage(int serverLanguage) {
         || (serverLanguage >= 224 && serverLanguage <= 247)) {
       return (byte) serverLanguage;
     }
+
     if (getMajorServerVersion() == 5 && getMinorServerVersion() <= 1) {
       // 5.1 version doesn't know 4 bytes utf8
       return (byte) 33; // utf8_general_ci
     }
+
+    // if server language is utf8mb3, use utf8mb4 equivalent collation
+    if (serverLanguage == 33) {
+      // utf8mb4_general_ci
+      return 45;
+    }
+
+    if (serverLanguage == 83) {
+      // utf8mb4_bin
+      return 46;
+    }
+
+    if (serverLanguage >= 192 && serverLanguage <= 215) {
+      // equivalent utf8mb4 collation
+      return (byte) (serverLanguage - 32);
+    }
+
     return (byte) 224; // UTF8MB4_UNICODE_CI;
   }