Remove unused lock workflow

.github/lock.yml

@@ -1,29 +0,0 @@
-# Configuration for Lock Threads - https://github.com/dessant/lock-threads
-
-# Number of days of inactivity before a closed issue or pull request is locked
-daysUntilLock: 365
-
-# Skip issues and pull requests created before a given timestamp. Timestamp must
-# follow ISO 8601 (`YYYY-MM-DD`). Set to `false` to disable
-skipCreatedBefore: false
-
-# Issues and pull requests with these labels will be ignored. Set to `[]` to disable
-exemptLabels: []
-
-# Label to add before locking, such as `outdated`. Set to `false` to disable
-lockLabel: false
-
-# Comment to post before locking. Set to `false` to disable
-lockComment: >
-  This thread has been automatically locked since there has not been
-  any recent activity after it was closed. Please open a new issue for
-  related bugs.
-
-  Please chat to us on [discourse](https://discourse.libretime.org/) or
-  ask for help on our [chat](https://chat.libretime.org/) if you have any
-  questions or need further assistance with this issue.
-
-# Assign `resolved` as the reason for locking. Set to `false` to disable
-setLockReason: true
-# Limit to only `issues` or `pulls`
-# only: issues