Set jackson version to 2.15.0 (#113)

Previously only databind module was set to a certain version.
Now both core and databind artifacts will use the version set.
Increased from 2.13.4.2.
Gets rid of CVE-2025-52999 from security scanner reports.

Author: Bouncheck

pom.xml

@@ -22,7 +22,7 @@
         <scylladb.version>4.19.0.1</scylladb.version>
         <skipIntegrationTests>false</skipIntegrationTests>
         <!-- transitive dependency versions -->
-        <jackson-databind.version>2.13.4.2</jackson-databind.version>
+        <jackson.version>2.15.0</jackson.version>
         <guava.version>24.1.1-jre</guava.version>
         <gpg.passphrase/>
         <release.autopublish>false</release.autopublish>
@@ -234,10 +234,15 @@
 
     <dependencyManagement>
         <dependencies>
+            <dependency>
+                <groupId>com.fasterxml.jackson.core</groupId>
+                <artifactId>jackson-core</artifactId>
+                <version>${jackson.version}</version>
+            </dependency>
             <dependency>
                 <groupId>com.fasterxml.jackson.core</groupId>
                 <artifactId>jackson-databind</artifactId>
-                <version>${jackson-databind.version}</version>
+                <version>${jackson.version}</version>
             </dependency>
         </dependencies>
     </dependencyManagement>