feat: Use shared lock-threads workflow

.github/workflows/lock-threads.yaml

@@ -1,8 +1,9 @@
-name: 'Lock Threads'
+name: 'Lock Closed Threads'
 
 on:
   schedule:
-    - cron: '42 5 * * *' # 5:42 AM UTC every day
+    - cron: '42 5 * * 1' # 5:42 AM UTC every Monday
+  repository_dispatch: { types: [lock_threads] }
   workflow_dispatch:
 
 permissions:
@@ -14,25 +15,5 @@ concurrency:
   group: lock-threads
 
 jobs:
-  action:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: dessant/lock-threads@v4
-        with:
-          # Remove the line below to turn on pull request locking
-          process-only: 'issues'
-
-          # Issue-locking options
-          issue-inactive-days: 60
-          issue-comment: >
-            This issue has been automatically locked. If you believe you have
-            found a related problem, please open a new issue (with
-            [a reprex](https://reprex.tidyverse.org/)) and link to this issue.
-
-          # Pull request-locking options
-          pr-inactive-days: 60
-          pull-comment: >
-            This pull request has been automatically locked. If you believe
-            you have found a related problem, please open a new issue
-            (with [a reprex](https://reprex.tidyverse.org/)) and link to this
-            pull request.
+  lock-threads:
+    uses: rstudio/shiny-workflows/.github/workflows/lock-threads.yaml@v1