Fix @SInCE on the new Java isTerminal setter

ToolDefinition.isTerminal(boolean) is introduced by this PR but was
tagged @SInCE 1.0.7, a version released long ago in which the method did
not exist, so the generated javadoc would misstate its availability.

1.0.11 is the current unreleased version: the pom is at
1.0.10-preview.3-SNAPSHOT, and the eight java/src/main files carrying
@SInCE 1.0.11 include ToolDefinition.createOverride in this same file.

This was the only @SInCE tag the PR added.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: examon

java/src/main/java/com/github/copilot/rpc/ToolDefinition.java

@@ -395,7 +395,7 @@ public ToolDefinition metadata(Map<String, Object> value) {
      *            {@code true} to end the agent turn after a successful call to this
      *            tool
      * @return a new {@code ToolDefinition} with the flag applied
-     * @since 1.0.7
+     * @since 1.0.11
      */
     @CopilotExperimental
     public ToolDefinition isTerminal(boolean value) {