Fix handling of dev version (#913)

Author: blink1073

.github/workflows/check-release.yml

@@ -24,6 +24,7 @@ jobs:
         if: ${{ matrix.group == 'check_release' }}
         uses: jupyter-server/jupyter_releaser/.github/actions/check-release@v1
         with:
+          version_spec: 100.100.100
           token: ${{ secrets.GITHUB_TOKEN }}
       - name: Run Link Check
         if: ${{ matrix.group == 'link_check' }}

RELEASE.md

@@ -4,6 +4,9 @@
 
 The recommended way to make a release is to use [`jupyter_releaser`](https://github.com/jupyter-server/jupyter_releaser#checklist-for-adoption).
 
+Note that we must use manual versions since Jupyter Releaser does not
+yet support "next" or "patch" when dev versions are used.
+
 ## Manual Release
 
 To create a manual release, perform the following steps: