feat: add {xrootd,zenodo}-mcp-server to xl

Author: wdconinc

spack-environment/xl/spack.yaml

@@ -130,5 +130,7 @@ spack:
   - stow
   - strace
   - valgrind
-  - xrootd
   - xeyes
+  - xrootd
+  - xrootd-mcp-server
+  - zenodo-mcp-server