replace instant with web-time (#5800)

* replace instant with web_time

* Merge branch 'unstable' into replace-instant-gossipsub

# Conflicts:
#	Cargo.lock
#	beacon_node/lighthouse_network/Cargo.toml

Cargo.lock

@@ -3376,7 +3376,6 @@ dependencies = [
  "futures-timer",
  "getrandom",
  "hex_fmt",
- "instant",
  "libp2p",
  "prometheus-client",
  "quick-protobuf",
@@ -3388,6 +3387,7 @@ dependencies = [
  "sha2 0.10.8",
  "tracing",
  "void",
+ "web-time",
 ]
 
 [[package]]
@@ -4956,7 +4956,6 @@ dependencies = [
  "futures",
  "gossipsub",
  "hex",
- "instant",
  "lazy_static",
  "libp2p",
  "libp2p-mplex",
@@ -9365,6 +9364,16 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "web-time"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a6580f308b1fad9207618087a65c04e7a10bc77e02c8e84e9b00dd4b12fa0bb"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "web3signer_tests"
 version = "0.1.0"