Revert "SONAR-11942 Drop support of Oracle 11g and 12.1"

This reverts commit 51d491b252.

sonar-application/src/main/assembly/conf/sonar.properties

@@ -28,9 +28,10 @@
 #sonar.jdbc.url=jdbc:mysql://localhost:3306/sonar?useUnicode=true&characterEncoding=utf8&rewriteBatchedStatements=true&useConfigs=maxPerformance&useSSL=false
 
 
-#----- Oracle 12.2, 18c and 19c
+#----- Oracle 11g/12c
 # The Oracle JDBC driver must be copied into the directory extensions/jdbc-driver/oracle/.
-# Only the thin client is supported, and only the versions 12.2.x+ can be used.
+# Only the thin client is supported, and only the versions 11.2.x or 12.2.x must be used. See
+# https://jira.sonarsource.com/browse/SONAR-9758 for more details.
 # If you need to set the schema, please refer to http://jira.sonarsource.com/browse/SONAR-5000
 #sonar.jdbc.url=jdbc:oracle:thin:@localhost:1521/XE