Update igd to v0.12.1 (#4257)

## Issue Addressed

https://github.com/sigp/lighthouse/issues/4171

## Proposed Changes

Through [this PR](https://github.com/sbstp/rust-igd/pull/56) in rust-igd, `igd` v0.12.1 no longer panics if there is an issue while searching for a gateway. So updating igd makes lighthouse emit a helpful log instead of panicking.

## Additional Info

No CHANGELOG exists in rust-igd. 👀 Here is the commit history between v0.11.1 and v0.12.1. No breaking changes.

https://github.com/sbstp/rust-igd/compare/v0.11.1...v0.12.1

Cargo.lock

@@ -423,13 +423,14 @@ checksum = "debc29dde2e69f9e47506b525f639ed42300fc014a3e007832592448fa8e4599"
 
 [[package]]
 name = "attohttpc"
-version = "0.10.1"
+version = "0.16.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "baf13118df3e3dce4b5ac930641343b91b656e4e72c8f8325838b01a4b1c9d45"
+checksum = "fdb8867f378f33f78a811a8eb9bf108ad99430d7aad43315dd9319c827ef6247"
 dependencies = [
  "http",
  "log",
  "url",
+ "wildmatch",
 ]
 
 [[package]]
@@ -3521,13 +3522,13 @@ dependencies = [
 
 [[package]]
 name = "igd"
-version = "0.11.1"
+version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2fd32c880165b2f776af0b38d206d1cabaebcf46c166ac6ae004a5d45f7d48ef"
+checksum = "556b5a75cd4adb7c4ea21c64af1c48cefb2ce7d43dc4352c720a1fe47c21f355"
 dependencies = [
  "attohttpc",
  "log",
- "rand 0.7.3",
+ "rand 0.8.5",
  "url",
  "xmltree",
 ]
@@ -9478,6 +9479,12 @@ version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "17882f045410753661207383517a6f62ec3dbeb6a4ed2acce01f0728238d1983"
 
+[[package]]
+name = "wildmatch"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f44b95f62d34113cf558c93511ac93027e03e9c29a60dd0fd70e6e025c7270a"
+
 [[package]]
 name = "winapi"
 version = "0.3.9"

beacon_node/network/Cargo.toml

@@ -35,7 +35,7 @@ lazy_static = "1.4.0"
 lighthouse_metrics = { path = "../../common/lighthouse_metrics" }
 logging = { path = "../../common/logging" }
 task_executor = { path = "../../common/task_executor" }
-igd = "0.11.1"
+igd = "0.12.1"
 itertools = "0.10.0"
 num_cpus = "1.13.0"
 lru_cache = { path = "../../common/lru_cache" }