Update outdated dependencies (#2425)

This updates some older dependencies to address a few cargo audit warnings.

The majority of warnings come from network dependencies which will be addressed in #2389. 

This PR contains some minor dep updates that are not network related.

Co-authored-by: Michael Sproul <michael@sigmaprime.io>

common/fallback/Cargo.toml

@@ -7,4 +7,4 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-itertools = "0.9.0"
+itertools = "0.9.0"

common/monitoring_api/Cargo.toml

@@ -21,4 +21,4 @@ slog = "2.5.2"
 store = { path = "../../beacon_node/store" }
 lazy_static = "1.4.0"
 regex = "1"
-sensitive_url = { path = "../sensitive_url" }
+sensitive_url = { path = "../sensitive_url" }

common/remote_signer_consumer/tests/post.rs

@@ -121,7 +121,7 @@ mod post {
         testcase(
             "unix:/run/foo.socket",
             &format!(
-                "[Reqwest - Builder] Url {{ scheme: \"unix\", username: \"\", password: None, host: None, port: None, path: \"/run/foo.socket/sign/{}\", query: None, fragment: None }}",
+                "[Reqwest - Builder] Url {{ scheme: \"unix\", cannot_be_a_base: false, username: \"\", password: None, host: None, port: None, path: \"/run/foo.socket/sign/{}\", query: None, fragment: None }}",
                 PUBLIC_KEY_1
             ),
         );
@@ -129,7 +129,7 @@ mod post {
         testcase(
             "http://127.0.0.1:0",
             &format!(
-                "[Reqwest - Request] Url {{ scheme: \"http\", username: \"\", password: None, host: Some(Ipv4(127.0.0.1)), port: Some(0), path: \"/sign/{}\", query: None, fragment: None }}",
+                "[Reqwest - Request] Url {{ scheme: \"http\", cannot_be_a_base: false, username: \"\", password: None, host: Some(Ipv4(127.0.0.1)), port: Some(0), path: \"/sign/{}\", query: None, fragment: None }}",
                 PUBLIC_KEY_1
             ),
         );