chore(deps): update dependency org.postgresql:postgresql to v42.2.23 (GoogleCloudPlatform#5574)

Author: renovate-bot

cloud-sql/postgres/client-side-encryption/pom.xml

@@ -67,7 +67,7 @@
         <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>42.2.22</version>
+      <version>42.2.23</version>
     </dependency>
     <dependency>
       <groupId>com.google.crypto.tink</groupId>

cloud-sql/postgres/servlet/pom.xml

@@ -52,7 +52,7 @@
     <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>42.2.22</version>
+      <version>42.2.23</version>
     </dependency>
     <dependency>
       <groupId>com.google.cloud.sql</groupId>

flexible/postgres/pom.xml

@@ -79,7 +79,7 @@
     <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>42.2.22</version>
+      <version>42.2.23</version>
     </dependency>
 
     <dependency>