fix(deps): update dependency org.hsqldb:hsqldb to v2.7.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.hsqldb:hsqldb (source)	2.5.0 -> 2.7.4

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[Naenyn]

HSQL 2.6 introduced an alternative jar for jdk8. To update this dependency, we'd have to update our build.gradle to conditionally pull in the appropriate jar based on whether we're using jdk8 or 11+. Given that uPortal will be moving to 11+, I suggest we hold off on this upgrade as it will be simpler to handle once jdk8 is dropped.

Edit: See https://hsqldb.org/doc/2.0/changelist_2_0.txt for HSQL changelog
Edit 2: See https://stackoverflow.com/questions/40533455/switching-dependencies-in-gradle-depending-on-platform for possible gradle edit.