8376035: Remove EA from the JDK 26 version string with first RC promotion

Reviewed-by: mikael, iris, erikj

Author: JesperIRL

make/conf/version-numbers.conf

@@ -39,4 +39,4 @@ DEFAULT_VERSION_CLASSFILE_MINOR=0
 DEFAULT_VERSION_DOCS_API_SINCE=11
 DEFAULT_ACCEPTABLE_BOOT_VERSIONS="25 26"
 DEFAULT_JDK_SOURCE_TARGET_VERSION=26
-DEFAULT_PROMOTED_VERSION_PRE=ea
+DEFAULT_PROMOTED_VERSION_PRE=