Fix PrettyTables v3 compatibility: change header to column_labels

PrettyTables v3.0.0 introduced breaking API changes.
The `header` parameter has been renamed to `column_labels`.
This commit updates the extension to use the new parameter name
to ensure compatibility with both v2.4+ and v3.x of PrettyTables.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: ChrisRackauckas

ext/SymbolicIndexingInterfacePrettyTablesExt/SymbolicIndexingInterfacePrettyTablesExt.jl

@@ -36,7 +36,7 @@ function SymbolicIndexingInterface.show_params(
     end
 
     pretty_table(io, [params[1:num_shown] vals[1:num_shown]];
-        header = ["Parameter", "Value"],
+        column_labels = ["Parameter", "Value"],
         kwargs...)
 
     if num_shown < length(params)