Update dependencies ahead of next release (#8015)

Updates dependencies:
parity-db 0.2.2
paste
prometheus 0.11
cfg-if 1.0
strum 0.20
env_logger 0.8
pin-project
prost
nix
platforms
quickcheck 1.0

substrate/client/network/src/protocol/sync/extra_requests.rs

@@ -345,8 +345,7 @@ impl<'a, B: BlockT> Matcher<'a, B> {
 mod tests {
 	use crate::protocol::sync::PeerSync;
 	use sp_blockchain::Error as ClientError;
-	use quickcheck::{Arbitrary, Gen, QuickCheck, StdThreadGen};
-	use rand::Rng;
+	use quickcheck::{Arbitrary, Gen, QuickCheck};
 	use std::collections::{HashMap, HashSet};
 	use super::*;
 	use sp_test_primitives::{Block, BlockNumber, Hash};
@@ -373,7 +372,7 @@ mod tests {
 			}
 		}
 
-		QuickCheck::with_gen(StdThreadGen::new(19))
+		QuickCheck::new()
 			.quickcheck(property as fn(ArbitraryPeers))
 	}
 
@@ -425,7 +424,7 @@ mod tests {
 			previously_active == requests.pending_requests.iter().cloned().collect::<HashSet<_>>()
 		}
 
-		QuickCheck::with_gen(StdThreadGen::new(19))
+		QuickCheck::new()
 			.quickcheck(property as fn(ArbitraryPeers) -> bool)
 	}
 
@@ -457,7 +456,7 @@ mod tests {
 			}
 		}
 
-		QuickCheck::with_gen(StdThreadGen::new(19))
+		QuickCheck::new()
 			.quickcheck(property as fn(ArbitraryPeers))
 	}
 
@@ -527,11 +526,11 @@ mod tests {
 	struct ArbitraryPeerSyncState(PeerSyncState<Block>);
 
 	impl Arbitrary for ArbitraryPeerSyncState {
-		fn arbitrary<G: Gen>(g: &mut G) -> Self {
-			let s = match g.gen::<u8>() % 4 {
+		fn arbitrary(g: &mut Gen) -> Self {
+			let s = match u8::arbitrary(g) % 4 {
 				0 => PeerSyncState::Available,
 				// TODO: 1 => PeerSyncState::AncestorSearch(g.gen(), AncestorSearchState<B>),
-				1 => PeerSyncState::DownloadingNew(g.gen::<BlockNumber>()),
+				1 => PeerSyncState::DownloadingNew(BlockNumber::arbitrary(g)),
 				2 => PeerSyncState::DownloadingStale(Hash::random()),
 				_ => PeerSyncState::DownloadingJustification(Hash::random()),
 			};
@@ -543,12 +542,12 @@ mod tests {
 	struct ArbitraryPeerSync(PeerSync<Block>);
 
 	impl Arbitrary for ArbitraryPeerSync {
-		fn arbitrary<G: Gen>(g: &mut G) -> Self {
+		fn arbitrary(g: &mut Gen) -> Self {
 			let ps = PeerSync {
 				peer_id: PeerId::random(),
-				common_number: g.gen(),
+				common_number: u64::arbitrary(g),
 				best_hash: Hash::random(),
-				best_number: g.gen(),
+				best_number: u64::arbitrary(g),
 				state: ArbitraryPeerSyncState::arbitrary(g).0,
 			};
 			ArbitraryPeerSync(ps)
@@ -559,7 +558,7 @@ mod tests {
 	struct ArbitraryPeers(HashMap<PeerId, PeerSync<Block>>);
 
 	impl Arbitrary for ArbitraryPeers {
-		fn arbitrary<G: Gen>(g: &mut G) -> Self {
+		fn arbitrary(g: &mut Gen) -> Self {
 			let mut peers = HashMap::with_capacity(g.size());
 			for _ in 0 .. g.size() {
 				let ps = ArbitraryPeerSync::arbitrary(g).0;