Bump jackson from 2.21.4 to 2.21.5 to fix CVE-2026-59889

pom.xml

@@ -74,6 +74,7 @@
         <tomcat.version>10.1.56</tomcat.version> <!-- to fix CVE-2026-53434 and CVE-2026-55955. Pinned via the tomcat-embed overrides below: spring-boot-dependencies is imported as a BOM, so this property alone would not win. TODO: remove when fixed in spring-boot-dependencies -->
         <httpcore5.version>5.4.3</httpcore5.version> <!-- to fix CVE-2026-54399 and CVE-2026-54428 (no fix exists on the 5.3.x line; httpclient5 5.5.2 from the Spring Boot BOM is compatible with httpcore5 5.4.x). Pinned via the httpcore5 overrides below: spring-boot-dependencies is imported as a BOM, so this property alone would not win. TODO: remove when fixed in spring-boot-dependencies -->
         <logback.version>1.5.38</logback.version> <!-- to fix CVE-2026-13006 (1.5.36 as reported by the scanner is still vulnerable; 1.5.37 removed Janino conditional processing entirely, 1.5.38 adds a HardenedObjectInputStream fix). Pinned via the logback overrides below: spring-boot-dependencies is imported as a BOM, so this property alone would not win. TODO: remove when fixed in spring-boot-dependencies -->
+        <jackson-bom.version>2.21.5</jackson-bom.version> <!-- to fix CVE-2026-59889. Pinned via the jackson-bom import below: spring-boot-dependencies re-imports jackson-bom with its own placeholder, so this property alone would not win. TODO: remove when fixed in spring-boot-dependencies -->
         <javax.xml.bind-api.version>2.4.0-b180830.0359</javax.xml.bind-api.version>
         <jjwt.version>0.12.5</jjwt.version>
         <rat.version>0.10</rat.version> <!-- unused -->
@@ -1059,6 +1060,15 @@
                 <version>${logback.version}</version>
             </dependency>
             <!-- End of logback version override -->
+            <!-- Temporary jackson-bom version override -->
+            <dependency>
+                <groupId>com.fasterxml.jackson</groupId>
+                <artifactId>jackson-bom</artifactId>
+                <version>${jackson-bom.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+            <!-- End of jackson-bom version override -->
             <dependency>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-dependencies</artifactId>