fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-COMH2DATABASE-1769238
- https://snyk.io/vuln/SNYK-JAVA-COMH2DATABASE-2331071
- https://snyk.io/vuln/SNYK-JAVA-COMH2DATABASE-2348247
- https://snyk.io/vuln/SNYK-JAVA-ORGPOSTGRESQL-2390459
- https://snyk.io/vuln/SNYK-JAVA-ORGPOSTGRESQL-2401816
- https://snyk.io/vuln/SNYK-JAVA-ORGPOSTGRESQL-2970521

Author: snyk-bot

pom.xml

@@ -43,12 +43,12 @@
     <dependency>
       <groupId>com.h2database</groupId>
       <artifactId>h2</artifactId>
-      <version>1.4.200</version>
+      <version>2.1.210</version>
     </dependency>
     <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>42.2.16</version>
+      <version>42.3.3</version>
     </dependency>
     <dependency>
       <groupId>hiccup</groupId>