Merge pull request #20862 from Homebrew/actionlint-labels

.github/actionlint: remove upstream supported labels

Author: ZhongRuoyu

.github/actionlint.yaml

@@ -1,6 +1,6 @@
 self-hosted-runner:
   # Labels of self-hosted or not-yet-known-upstream runner in array of strings.
-  labels: [macos-15-intel, macos-26]
+  labels: []
 # Configuration variables in array of strings defined in your repository or
 # organization. `null` means disabling configuration variables check.
 # Empty array means no configuration variable is allowed.