Bump lru from 0.4.3 to 0.6.1 (#7577)

Bumps [lru](https://github.com/jeromefroe/lru-rs) from 0.4.3 to 0.6.1.
- [Release notes](https://github.com/jeromefroe/lru-rs/releases)
- [Changelog](https://github.com/jeromefroe/lru-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jeromefroe/lru-rs/compare/0.4.3...0.6.1)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

substrate/Cargo.lock

@@ -3418,15 +3418,6 @@ dependencies = [
  "serde_json",
 ]
 
-[[package]]
-name = "lru"
-version = "0.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0609345ddee5badacf857d4f547e0e5a2e987db77085c24cd887f73573a04237"
-dependencies = [
- "hashbrown 0.6.3",
-]
-
 [[package]]
 name = "lru"
 version = "0.5.3"
@@ -7116,7 +7107,7 @@ dependencies = [
  "linked-hash-map",
  "linked_hash_set",
  "log",
- "lru 0.4.3",
+ "lru 0.6.1",
  "nohash-hasher",
  "parity-scale-codec",
  "parking_lot 0.10.2",
@@ -7162,7 +7153,7 @@ dependencies = [
  "futures-timer 3.0.2",
  "libp2p",
  "log",
- "lru 0.4.3",
+ "lru 0.6.1",
  "quickcheck",
  "rand 0.7.3",
  "sc-network",
@@ -8109,7 +8100,7 @@ name = "sp-blockchain"
 version = "2.0.0"
 dependencies = [
  "log",
- "lru 0.4.3",
+ "lru 0.6.1",
  "parity-scale-codec",
  "parking_lot 0.10.2",
  "sp-block-builder",