docs(quickstart): replace deprecated testFail* using test_Revert_* and vm.expectRevert

[AlexD10S]

This updates the Quickstart → Launch a token test example.

Following the guide: https://docs.base.org/get-started/launch-token#token-launch-platforms-on-base I got the error:

Ran 2 tests for test/MyToken.t.sol:MyTokenTest
[FAIL: `testFail*` has been removed. Consider changing to test_Revert[If|When]_Condition and expecting a revert] testFailMintExceedsMaxSupply() (gas: 0)
[FAIL: `testFail*` has been removed. Consider changing to test_Revert[If|When]_Condition and expecting a revert] testFailUnauthorizedMinting() (gas: 0)
Suite result: FAILED. 0 passed; 2 failed; 0 skipped; finished in 3.27ms (0.00ns CPU time)

Foundry removed support for testFail* tests. Tests should now explicitly expect reverts using vm.expectRevert(...) and use the test_Revert_* naming pattern e.g https://getfoundry.sh/forge/tests/writing-tests/

[cb-heimdall]

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