Bump com.yugabyte:jdbc-yugabytedb in /modules/yugabytedb

Bumps [com.yugabyte:jdbc-yugabytedb](https://github.com/yugabyte/pgjdbc) from 42.3.5-yb-6 to 42.7.3-yb-4.
- [Release notes](https://github.com/yugabyte/pgjdbc/releases)
- [Changelog](https://github.com/yugabyte/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](yugabyte/pgjdbc@v42.3.5-yb-6...v42.7.3-yb-4)

---
updated-dependencies:
- dependency-name: com.yugabyte:jdbc-yugabytedb
  dependency-version: 42.7.3-yb-4
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

modules/yugabytedb/build.gradle

@@ -6,5 +6,5 @@ dependencies {
     // YCQL driver
     testImplementation 'com.yugabyte:java-driver-core:4.15.0-yb-2-TESTFIX.0'
     // YSQL driver
-    testRuntimeOnly 'com.yugabyte:jdbc-yugabytedb:42.3.5-yb-6'
+    testRuntimeOnly 'com.yugabyte:jdbc-yugabytedb:42.7.3-yb-4'
 }