fix(test): add nifi-security-utils-api to resolve TlsConfiguration ClassNotFoundException

SSLContextService in NiFi 2.x references TlsConfiguration (org.apache.nifi.security.util)
at class-load time. When Mockito/byte-buddy instruments the interface, it must resolve all
referenced types — including the return type of getTlsConfiguration() — or fail with
ClassNotFoundException. nifi-security-utils-api is the correct Maven Central artifact
that contains TlsConfiguration for NiFi 2.x; nifi-security-utils is not published.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: JBCongdon

nifi-tdf-processors/pom.xml

@@ -96,6 +96,13 @@
             <version>1.14.17</version>
             <scope>test</scope>
         </dependency>
+        <!-- TlsConfiguration referenced by SSLContextService; not a transitive dep in NiFi 2.x -->
+        <dependency>
+            <groupId>org.apache.nifi</groupId>
+            <artifactId>nifi-security-utils-api</artifactId>
+            <version>${nifi.version}</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
     <build>
         <plugins>