Bump postgresql from 42.4.1 to 42.4.3 in /lab4/product-service (#44)

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.4.1 to 42.4.3.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.4.1...REL42.4.3)

---
updated-dependencies:
- dependency-name: org.postgresql:postgresql
  dependency-type: direct:production
...

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Author: dependabot[bot]

lab4/product-service/pom.xml

@@ -113,7 +113,7 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
         <dependency>
             <groupId>org.postgresql</groupId>
             <artifactId>postgresql</artifactId>
-            <version>42.4.1</version>
+            <version>42.4.3</version>
         </dependency>
         <dependency>
             <groupId>com.amazon.aws.partners.saasfactory</groupId>