Merge pull request #281 from buildkite-plugins/renovate/plugin-tester-1.x

chore(deps): update buildkite plugin plugin-tester to v1.3.0

Author: pzeballos

.buildkite/pipeline.yml

@@ -1,7 +1,7 @@
 steps:
   - label: ":bash: Plugin"
     plugins:
-      - plugin-tester#v1.2.0: ~
+      - plugin-tester#v1.3.0: ~
 
   - label: ":ruby: Ruby"
     plugins: