Bump nitrite from 3.3.0 to 3.4.3

Bumps [nitrite](https://github.com/dizitart/nitrite-database) from 3.3.0 to 3.4.3.
- [Release notes](https://github.com/dizitart/nitrite-database/releases)
- [Commits](nitrite/nitrite-java@v3.3.0...v3.4.3)

Signed-off-by: dependabot[bot] <support@github.com>

synapse-core/build.gradle

@@ -24,7 +24,7 @@ dependencies {
 
     implementation "com.googlecode.concurrentlinkedhashmap:concurrentlinkedhashmap-lru:1.4.2"
 
-    implementation("org.dizitart:nitrite:3.3.0") {
+    implementation("org.dizitart:nitrite:3.4.3") {
         exclude group: "javax.validation", module: "validation-api"
     }