chore: bump indexmap from 1.4.0 to 1.5.1

Bumps [indexmap](https://github.com/bluss/indexmap) from 1.4.0 to 1.5.1.
- [Release notes](https://github.com/bluss/indexmap/releases)
- [Commits](https://github.com/bluss/indexmap/compare/1.4.0...1.5.1)

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

Cargo.lock

@@ -1259,6 +1259,15 @@ dependencies = [
  "byteorder",
 ]
 
+[[package]]
+name = "hashbrown"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e91b62f79061a0bc2e046024cb7ba44b08419ed238ecbd9adbd787434b9e8c25"
+dependencies = [
+ "autocfg 1.0.0",
+]
+
 [[package]]
 name = "heck"
 version = "0.3.1"
@@ -1513,11 +1522,12 @@ checksum = "d480125acf340d6a6e59dab69ae19d6fca3a906e1eade277671272cc8f73794b"
 
 [[package]]
 name = "indexmap"
-version = "1.4.0"
+version = "1.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c398b2b113b55809ceb9ee3e753fcbac793f1956663f3c36549c1346015c2afe"
+checksum = "86b45e59b16c76b11bf9738fd5d38879d3bd28ad292d7b313608becb17ae2df9"
 dependencies = [
  "autocfg 1.0.0",
+ "hashbrown",
 ]
 
 [[package]]

core/Cargo.toml

@@ -24,7 +24,7 @@ crossbeam-channel = "0.4"
 ed25519-dalek = "=1.0.0-pre.4"
 fs_extra = "1.1.0"
 flate2 = "1.0"
-indexmap = "1.4"
+indexmap = "1.5"
 itertools = "0.9.0"
 jsonrpc-core = "14.2.0"
 jsonrpc-core-client = { version = "14.2.0", features = ["ws"] }

tokens/Cargo.toml

@@ -14,7 +14,7 @@ clap = "2.33.0"
 console = "0.11.3"
 csv = "1.1.3"
 dirs = "2.0.2"
-indexmap = "1.4.0"
+indexmap = "1.5.1"
 indicatif = "0.15.0"
 pickledb = "0.4.1"
 serde = { version = "1.0", features = ["derive"] }