Bug 1668243 - [rust-mozrunner] Release version 0.12.1. r=webdriver-reviewers,jgraham

Differential Revision: https://phabricator.services.mozilla.com/D101589

Cargo.lock

@@ -3298,7 +3298,7 @@ dependencies = [
 
 [[package]]
 name = "mozrunner"
-version = "0.12.0"
+version = "0.12.1"
 dependencies = [
  "dirs",
  "log",

testing/mozbase/rust/mozrunner/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mozrunner"
-version = "0.12.0"
+version = "0.12.1"
 authors = ["Mozilla"]
 description = "Reliable Firefox process management."
 repository = "https://hg.mozilla.org/mozilla-central/file/tip/testing/mozbase/rust/mozrunner"