Merge pull request #1068 from volta-cli/dependabot/cargo/which-4.2.2

Bump which from 2.0.1 to 4.2.2

Author: charlespierce

Cargo.lock

@@ -33,7 +33,7 @@ cfg-if = "1.0"
 mockito = { version = "0.14.0", optional = true }
 test-support = { path = "crates/test-support" }
 textwrap = "0.11.0"
-which = "2.0.1"
+which = "4.2.2"
 dirs = "1.0.4"
 volta-migrate = { path = "crates/volta-migrate" }