labeler: update "continuous integration" label name (#3151)

The typo in the label name as been fixed, update the labeller config.

.github/labeler.yml

@@ -17,7 +17,7 @@
   - docs/package/gluon-config-mode-*
   - package/gluon-config-mode-*/**
   - package/gluon-web*/**
-"3. topic: continous integration":
+"3. topic: continuous integration":
   - .github/workflows/*
   - contrib/actions/**
   - contrib/ci/**