Bump org.postgresql:postgresql from 42.7.0 to 42.7.3

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.7.0 to 42.7.3.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.7.0...REL42.7.3)

---
updated-dependencies:
- dependency-name: org.postgresql:postgresql
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle.kts

@@ -44,7 +44,7 @@ dependencies {
 	api("io.taff.exposed:exposed-core:0.10.0")
 	api("io.taff.exposed:exposed-jdbc:0.10.0")
 	api("io.taff.exposed:exposed-java-time:0.10.0")
-	implementation("org.postgresql:postgresql:42.7.0")
+	implementation("org.postgresql:postgresql:42.7.3")
 	testImplementation("io.taff:spek-expekt:0.10.3")
 	testImplementation(enforcedPlatform("org.junit:junit-bom:5.10.2"))
 }