.github: Remove lockdown.yml

.github/lockdown.yml

@@ -1,34 +0,0 @@
-# Configuration for Repo Lockdown - https://github.com/dessant/repo-lockdown
-
-# Close issues and pull requests
-close: true
-
-# Lock issues and pull requests
-lock: true
-
-issues:
-  comment: |
-    Thank you for your interest in the QEMU project.
-
-    This repository is a read-only mirror of the project's repostories hosted
-    at https://gitlab.com/qemu-project/qemu.git.
-    The project does not process issues filed on GitHub.
-
-    The project issues are tracked on GitLab:
-    https://gitlab.com/qemu-project/qemu/-/issues
-
-    QEMU welcomes bug report contributions. You can file new ones on:
-    https://gitlab.com/qemu-project/qemu/-/issues/new
-
-pulls:
-  comment: |
-    Thank you for your interest in the QEMU project.
-
-    This repository is a read-only mirror of the project's repostories hosted
-    on https://gitlab.com/qemu-project/qemu.git.
-    The project does not process merge requests filed on GitHub.
-
-    QEMU welcomes contributions of code (either fixing bugs or adding new
-    functionality). However, we get a lot of patches, and so we have some
-    guidelines about contributing on the project website:
-    https://www.qemu.org/contribute/