Fix checkstyle reported warning in Main.java

[Pinti0001]

Add final before datatype to fix

WARNING:

Parameter provider should be final. (404:29) [FinalParameters]
Parameter options should be final. (404:65) [FinalParameters]
Parameter dbmsSpecificOptions should be final. (404:86) [FinalParameters]
Parameter databaseName should be final. (405:17) [FinalParameters]
Parameter r should be final. (405:38) [FinalParameters]

Following method warnings reported by checkstyle

Here is code where get warning

https://github.com/sqlancer/sqlancer/blob/main/src/sqlancer/Main.java

It's important to note that the use of the final keyword for method parameters is a matter of coding style and best practices. Some developers consider using final in method parameters and local variables to be unnecessary "code noise," especially in cases where unit tests are written properly to catch any harmful assignments to parameters. Additionally, tools like Sonar, FindBugs, and CheckStyle can be configured to break the build if assignment is made to parameters or local variables, providing an alternative approach to ensuring parameter immutability.