ci: remove "travis" prefix for release-please

We don't actually have a Travis CI config file (`.travis.yml`) anymore,
and this would be redundant to the "ci" prefix anyway.

Author: DeeDeeG

.github/workflows/release-please.yml

@@ -35,5 +35,4 @@ jobs:
             {"type":"chore","section":"Miscellaneous","hidden":false},
             {"type":"refactor","section":"Miscellaneous","hidden":false},
             {"type":"ci","section":"Miscellaneous","hidden":false},
-            {"type":"travis","section":"Miscellaneous","hidden":false},
             {"type":"meta","section":"Miscellaneous","hidden":false}]