update taskkill plugin (#231)

Author: jessicafalk

ci/nightly.android.firebase.test.yaml

@@ -33,7 +33,7 @@ windows: &windows
       - <<: *bk_system_error
       - <<: *bk_interrupted_by_signal
   plugins:
-    - ca-johnson/taskkill#v4.1: ~
+    - improbable-eng/taskkill#v4.4.1: ~
 
 steps:
   - label: "firebase-test-android-connect-to-spatialos-ENGINE_COMMIT_HASH_PLACEHOLDER"

ci/nightly.gen.auth.token.yaml

@@ -33,7 +33,7 @@ windows: &windows
       - <<: *bk_system_error
       - <<: *bk_interrupted_by_signal
   plugins:
-    - ca-johnson/taskkill#v4.1: ~
+    - improbable-eng/taskkill#v4.4.1: ~
 
 steps:
   - label: "generate-auth-token-and-deployment-name"

ci/nightly.ios.firebase.test.yaml

@@ -33,7 +33,7 @@ windows: &windows
       - <<: *bk_system_error
       - <<: *bk_interrupted_by_signal
   plugins:
-    - ca-johnson/taskkill#v4.1: ~
+    - improbable-eng/taskkill#v4.4.1: ~
 
 steps:
   - label: "firebase-test-ios-connect-to-spatialos-ENGINE_COMMIT_HASH_PLACEHOLDER"

ci/nightly.template.steps.yaml

@@ -32,7 +32,7 @@ windows: &windows
       - <<: *bk_system_error
       - <<: *bk_interrupted_by_signal
   plugins:
-    - ca-johnson/taskkill#v4.1: ~
+    - improbable-eng/taskkill#v4.4.1: ~
 
 macos: &macos
   agents: