Mark tree-sitter0.25 unwanted

Emacs 30 is not ready for tree-sitter 0.26, so a compat package is being
used in the meantime:

fedora-eln/eln#518
https://src.fedoraproject.org/rpms/emacs/c/85bd016ff1c1b6c9ccf7333eaae4935a81d0aa10

Author: yselkowitz

configs/rhel-sst-cs-plumbers--unwanted.yaml

@@ -10,6 +10,8 @@ data:
     - libtar
     - redhat-lsb
     - rtkit
+    # compat package
+    - tree-sitter0.25
   unwanted_packages:
     - emacs-terminal
     - network-scripts