Switch node-lookup repo to a main default branch

node-lookup is being set up with build/test/pre-commit CI and a main-based
workflow, so its Gitea repo config needs to match.

- Change default_branch from master to main.
- Rename the branch protection rule to main and update the required status
  checks to the new pipeline names (build, test, pre-commit) instead of the
  old lint/unit-tests contexts.

config/git.unkin.net/unkin/repository/node-lookup.yaml

@@ -1,14 +1,14 @@
 description: "A CLI tool written in Go that queries the PuppetDB API to look up and filter node facts."
 private: false
-default_branch: "master"
+default_branch: "main"
 default_delete_branch_after_merge: true
 default_merge_style: "squash"
 branch_protection:
-  - rule_name: "master"
+  - rule_name: "main"
     enable_push: false
     status_check_contexts:
-      - "ci/woodpecker/pr/lint"
+      - "ci/woodpecker/pr/build"
+      - "ci/woodpecker/pr/test"
       - "ci/woodpecker/pr/pre-commit"
-      - "ci/woodpecker/pr/unit-tests"
     approval_whitelist_users:
       - "unkinben"