Reduce CPU overhead of gossip (#10859)

substrate/Cargo.lock

@@ -64,9 +64,9 @@ dependencies = [
 
 [[package]]
 name = "ahash"
-version = "0.7.4"
+version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "43bb833f0bf979d8475d38fbf09ed3b8a55e1885fe93ad3f93239fc6a4f17b98"
+checksum = "fcb51a0695d8f838b1ee009b3fbf66bda078cd64590202a864a8f3e8c4315c47"
 dependencies = [
  "getrandom 0.2.3",
  "once_cell",
@@ -8333,6 +8333,7 @@ dependencies = [
 name = "sc-finality-grandpa"
 version = "0.10.0-dev"
 dependencies = [
+ "ahash",
  "assert_matches",
  "async-trait",
  "dyn-clone",
@@ -8491,6 +8492,7 @@ dependencies = [
 name = "sc-network-gossip"
 version = "0.10.0-dev"
 dependencies = [
+ "ahash",
  "async-std",
  "futures 0.3.16",
  "futures-timer",