Temporarily exclude build-infra link checks...

...because CONTRIBUTING.md is not on main yet, and we want the
draft PR to pass CI.  This commit should be removed from the
branch before taking the PR out of draft.

Author: handrews

.linkspector.yml

@@ -16,3 +16,4 @@ ignorePatterns:
   - pattern: 'https://www.w3.org/TR/xml-names11/'
   - pattern: 'https://www.npmjs.com/package/markdownlint'
   - pattern: 'https://www.merriam-webster.com/dictionary/'
+  - pattern: 'https://github.com/OAI/build-infra/blob/main/CONTRIBUTING.md'