[BUGFIX] Make Typo3DbQueryParser a Singleton

Typo3DbQueryParser gets injected in Typo3DbBackend, thus
it has to be a Singleton.

Resolves: #57338
Releases: 6.2
Change-Id: I5b845ef280d23b6893d308bc9013ef965637a1ef
Reviewed-on: https://review.typo3.org/28843
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel