fix(patches): support RcppParallel 6.2.1

This change will:\n\n- Relax the TBB include hunk context to tolerate the upstream TBB_CXXFLAGS block.\n- Pin the source patch to the verified RcppParallel version.

local/patches/RcppParallel/force-bundled-tbb.patch

@@ -40,15 +40,11 @@ index 6f6a745..e407986 100644
     if (is.null(name))
        return(tbbRoot)
  
-@@ -58,7 +58,7 @@ tbbCxxFlags <- function() {
-    flags <- c("-DRCPP_PARALLEL_USE_TBB=1")
- 
+@@ -58,3 +58,3 @@ tbbCxxFlags <- function() {
     # if TBB_INC is set, apply those library paths
 -   tbbInc <- Sys.getenv("TBB_INC", unset = TBB_INC)
 +   tbbInc <- bincraftGetenv("TBB_INC", unset = TBB_INC)
     if (!file.exists(tbbInc)) {
-       tbbInc <- system.file("include", package = "RcppParallel")
-    }
 @@ -117,7 +117,7 @@ tbbLdFlags <- function() {
     }