CI: Quote regex to avoid syntax error

* Regex on tag must be quoted to avoid YAML syntax error.

Author: matthewfeickert

.github/workflows/publish-package.yml

@@ -4,8 +4,8 @@ on:
     branches:
     - main
     tags:
-    - [0-9]+.[0-9]+
-    - [0-9]+.[0-9]+.[0-9]+
+    - '[0-9]+.[0-9]+'
+    - '[0-9]+.[0-9]+.[0-9]+'
   pull_request:
     branches:
     - main