Add GPG key for 2.2.0 release (#244)

Co-authored-by: Hang Ruan <ruanhang1993@apache.org>

Author: ruanhang1993

add-version.sh

@@ -112,6 +112,8 @@ elif [ "$flink_version" = "2.0.0" ]; then
     gpg_key="F8E419AA0B60C28879E876859DFF40967ABFC5A4"
 elif [ "$flink_version" = "2.1.0" ]; then
     gpg_key="7A14EF9AD986EF0D56B2E73F6AF817E6C59EC690"
+elif [ "$flink_version" = "2.2.0" ]; then
+    gpg_key="7BC9FA3EBE7E3DC7CD0EA0454C09617EAF241D76"
 else
     error "Missing GPG key ID for this release"
 fi