Update dependency org.immutables:value to v2.12.1 (#36)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pom.xml

@@ -49,7 +49,7 @@
         <jackson.databind.version>2.20.1</jackson.databind.version>
         <jackson.jdk8.version>2.20.1</jackson.jdk8.version>
         <rxjava.version>3.1.12</rxjava.version>
-        <immutables.version>2.12.0</immutables.version>
+        <immutables.version>2.12.1</immutables.version>
         <httpcomponents-client5.version>5.6</httpcomponents-client5.version>
 
         <junit.jupiter.version>6.0.2</junit.jupiter.version>