Exclude com.ibm.icu from deprecation report

As it's third party lib it doesn't play by the project rules thus just
polutes https://download.eclipse.org/eclipse/downloads/drops4/I20251103-1800/apitools/deprecation/apideprecation.html

Author: akurtakov

eclipse.platform.releng.tychoeclipsebuilder/eclipse/apiexclude/exclude_list_external.txt

@@ -22,6 +22,7 @@ junit-platform-commons
 junit-platform-engine
 junit-platform-launcher
 org.commonmark
+com.ibm.icu
 
 ## SPECIAL CASE FOR SWT: THE FRAGMENT IS ANALYZED AS PART OF THE HOST
 org.eclipse.swt.win32.win32.x86_64