Bump cluster-tools from 1.49 to 1.50 (#254)

Bumps [cluster-tools](https://github.com/scalableminds/cluster_tools) from 1.49 to 1.50.
- [Release notes](https://github.com/scalableminds/cluster_tools/releases)
- [Commits](scalableminds/cluster_tools@v1.49...v1.50)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

poetry.lock

@@ -12,7 +12,7 @@ numpy = "^1.17.4"
 pillow = "^6.2.1"
 wkw = "0.1.4"
 requests = "^2.22.0"
-cluster_tools = "1.49"
+cluster_tools = "1.50"
 natsort = "^6.2.0"
 psutil = "^5.6.7"
 nibabel = "^2.5.1"