Bump org.postgresql:postgresql from 42.6.1 to 42.7.3 in /backend (#7961)

Co-authored-by: dependabot[bot] <dependabot[bot]@users.noreply.github.com>

backend/build.gradle

@@ -74,7 +74,7 @@ dependencies {
     implementation 'org.springframework.boot:spring-boot-starter-validation'
     implementation 'io.hypersistence:hypersistence-utils-hibernate-62:3.7.6' // this provides additional types for JsonB and for ListArray types in Postgres
     implementation 'org.liquibase:liquibase-core:4.27.0'
-    implementation 'org.postgresql:postgresql:42.6.1'
+    implementation 'org.postgresql:postgresql:42.7.3'
 
     // data validation
     implementation 'com.googlecode.libphonenumber:libphonenumber:8.13.28'

backend/gradle.lockfile

@@ -155,7 +155,8 @@ org.bouncycastle:bcpkix-jdk18on:1.75=runtimeClasspath
 org.bouncycastle:bcprov-jdk18on:1.76=compileClasspath,runtimeClasspath
 org.bouncycastle:bcutil-jdk18on:1.73=compileClasspath
 org.bouncycastle:bcutil-jdk18on:1.75=runtimeClasspath
-org.checkerframework:checker-qual:3.33.0=compileClasspath,runtimeClasspath
+org.checkerframework:checker-qual:3.33.0=compileClasspath
+org.checkerframework:checker-qual:3.42.0=runtimeClasspath
 org.codehaus.woodstox:stax2-api:4.2.1=compileClasspath,runtimeClasspath
 org.eclipse.angus:angus-activation:2.0.1=runtimeClasspath
 org.eclipse.angus:jakarta.mail:1.1.0=compileClasspath,runtimeClasspath
@@ -176,7 +177,7 @@ org.liquibase:liquibase-core:4.27.0=compileClasspath,runtimeClasspath
 org.openapitools:jackson-databind-nullable:0.2.6=compileClasspath,runtimeClasspath
 org.ow2.asm:asm:9.3=compileClasspath,runtimeClasspath
 org.owasp.encoder:encoder:1.2=compileClasspath,runtimeClasspath
-org.postgresql:postgresql:42.6.1=compileClasspath,runtimeClasspath
+org.postgresql:postgresql:42.7.3=compileClasspath,runtimeClasspath
 org.projectlombok:lombok:1.18.30=compileClasspath
 org.reactivestreams:reactive-streams:1.0.4=compileClasspath,runtimeClasspath
 org.slf4j:jcl-over-slf4j:2.0.9=compileClasspath,runtimeClasspath