Update SPEC version of jakarta.json:jakarta.json-spec to 1.2-SNAPSHOT

spec/pom.xml

diff --git a/spec/pom.xml b/spec/pom.xml
index 3ebaa77..afc4c9e 100644
--- a/spec/pom.xml
+++ b/spec/pom.xml
@@ -27,7 +27,7 @@
     <groupId>jakarta.json</groupId>
     <artifactId>jakarta.json-spec</artifactId>
     <packaging>pom</packaging>
-    <version>1.1</version>
+    <version>1.2-SNAPSHOT</version>
     <name>Jakarta JSON Processing Specification</name>
 
     <properties>