Upgrade rust/crates/rayon-core to 1.9.1

Test: make
Change-Id: I5dfe74e1537ea24cc8bd005a32a7e5e4f2470b21
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
index b2082e4..d31ed22 100644
--- a/Cargo.toml.orig
+++ b/Cargo.toml.orig
@@ -1,6 +1,6 @@
 [package]
 name = "rayon-core"
-version = "1.9.0" # reminder to update html_root_url attribute
+version = "1.9.1" # reminder to update html_root_url attribute
 authors = ["Niko Matsakis <niko@alum.mit.edu>",
            "Josh Stone <cuviper@gmail.com>"]
 description = "Core APIs for Rayon"
@@ -23,8 +23,8 @@
 crossbeam-utils = "0.8.0"
 
 [dev-dependencies]
-rand = "0.7"
-rand_xorshift = "0.2"
+rand = "0.8"
+rand_xorshift = "0.3"
 scoped-tls = "1.0"
 
 [target.'cfg(unix)'.dev-dependencies]