Fix overeager query invalidation, optimize validation, bump gradle version

[ty1824]

Resolves several bugs:

• Queries assigned a value equal to their already-computed value would invalidate their dependencies
• Queries with transitive dependencies whose inputs had maybe changed would never validate (and thus always recompute).
• Added tests for these cases and several others.

Some enhancements:

• Eliminated a lot of dead code around input value verification (likely added to ensure correct behavior in the presence of the above bugs)
• Reduced the toString length of various query internals to make debugging easier.

[github-actions]

Coverage Results

File	Coverage [100.00%]	✅
inkt/src/main/kotlin/dev/dialector/inkt/next/QueryDatabaseImpl.kt	100.00%	✅
inkt/src/main/kotlin/dev/dialector/inkt/next/QueryDslImpl.kt	100.00%	✅

Total Project Coverage	93.16%	✅