Bump crate versions and dependencies

- Bump to rayon 1.2.1 and rayon-core 1.6.1.
- Increase crossbeam-deque to 0.7.2 to avoid duping crossbeam-utils.
- Increase demo's fixedbitset to 0.2.0 and glium to 0.25.1.
- Regenerate compat-Cargo.lock with the most current versions possible.

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "rayon"
 # Reminder to update html_rool_url in lib.rs when updating version
-version = "1.2.0"
+version = "1.2.1"
 authors = ["Niko Matsakis <niko@alum.mit.edu>",
            "Josh Stone <cuviper@gmail.com>"]
 description = "Simple work-stealing parallelism for Rust"
@@ -18,8 +18,8 @@ members = ["rayon-demo", "rayon-core", "rayon-futures"]
 exclude = ["ci"]
 
 [dependencies]
-rayon-core = { version = "1.6.0", path = "rayon-core" }
-crossbeam-deque = "0.7"
+rayon-core = { version = "1.6.1", path = "rayon-core" }
+crossbeam-deque = "0.7.2"
 
 # This is a public dependency!
 [dependencies.either]