Use a fixed neovim version (#2794)

CI is broken for latest neovim version

Related #2793

## Checklist

- [ ] I have added
[tests](https://www.cursorless.org/docs/contributing/test-case-recorder/)
- [ ] I have updated the
[docs](https://github.com/cursorless-dev/cursorless/tree/main/docs) and
[cheatsheet](https://github.com/cursorless-dev/cursorless/tree/main/cursorless-talon/src/cheatsheet)
- [ ] I have not broken the cheatsheet

.github/workflows/test.yml

@@ -24,7 +24,9 @@ jobs:
     runs-on: ${{ matrix.os }}
     env:
       APP_VERSION: ${{ matrix.app_version }}
-      NEOVIM_VERSION: ${{ matrix.app_version == 'stable' && 'stable' || 'v0.10.0' }}
+      # FIXME: https://github.com/cursorless-dev/cursorless/issues/2793
+      # NEOVIM_VERSION: ${{ matrix.app_version == 'stable' && 'stable' || 'v0.10.0' }}
+      NEOVIM_VERSION: ${{ matrix.app_version == 'stable' && 'v0.10.3' || 'v0.10.0' }}
       VSCODE_CRASH_DIR: ${{ github.workspace }}/artifacts/dumps
       VSCODE_LOGS_DIR: ${{ github.workspace }}/artifacts/logs
       CURSORLESS_REPO_ROOT: ${{ github.workspace }}