Bump crossbeam-epoch to 0.8.1

This also bumps the `rand` `dev-dependency` to `0.7`.
No breaking changes as far as I can tell.

crossbeam-epoch/CHANGELOG.md

@@ -1,3 +1,12 @@
+# Version 0.8.1
+
+- Bump `rand` dev-dependency to version 0.7.
+- Bump `autocfg` dependency to version 1.0. (#460)
+- Reduce stall in list iteration. (#376)
+- Stop stealing from the same deque. (#448)
+- Fix unsoundness issues by adopting `MaybeUninit`. (#458)
+- Fix use-after-free in lock-free queue. (#466)
+
 # Version 0.8.0
 
 - Bump the minimum required version to 1.28.

crossbeam-epoch/Cargo.toml

@@ -4,7 +4,7 @@ name = "crossbeam-epoch"
 # - Update CHANGELOG.md
 # - Update README.md
 # - Create "crossbeam-epoch-X.Y.Z" git tag
-version = "0.8.0"
+version = "0.8.1"
 authors = ["The Crossbeam Project Developers"]
 license = "MIT/Apache-2.0"
 readme = "README.md"
@@ -44,4 +44,4 @@ default-features = false
 autocfg = "1"
 
 [dev-dependencies]
-rand = "0.6"
+rand = "0.7"