Upstream took SCHEMA_BUMP 133 to 137, so the R provider bump moves to 138.
The pin test and the taken-versions list are updated to match. The import-target
benchmark keeps both the R and Rust arms in the heap-budgeted and context
language lists, and the tree-sitter readiness tests keep the R grammar checks
against the reworked report (R is now a peer-patch grammar and the held-grammar
counts changed).