Fix CVE-2025-22228 (#143)

See https://spring.io/security/cve-2025-22228

Fixes #142

Reviewed-on: #143
Reviewed-by: Nico Athanassiadis <nico@dsv.su.se>
Co-authored-by: Andreas Svanberg <andreass@dsv.su.se>
Co-committed-by: Andreas Svanberg <andreass@dsv.su.se>

pom.xml

@@ -28,7 +28,7 @@
         <querydsl.version>5.0.0</querydsl.version>
         <poi.version>5.4.0</poi.version>
 
-        <spring.boot.version>3.4.3</spring.boot.version>
+        <spring.boot.version>3.4.4</spring.boot.version>
         <springdoc.openapi.version>2.8.3</springdoc.openapi.version>
 
         <!-- Database stuff -->