BUG: Constrain aiohttp to <4.0

It is a transitive dependency of imjoy-elfinder[jupyter].

4.0a1 (current version), does not have published wheels. Prevent build
errors with:

```
pip install --pre 'itkwidgets[all]'
```

Author: thewtex

pyproject.toml

@@ -61,11 +61,13 @@ Source = "https://github.com/InsightSoftwareConsortium/itkwidgets"
 all = [
     "imjoy-jupyterlab-extension >=0.1.13",
     "imjoy-elfinder[jupyter]",
-    "imjoy-jupyter-extension >=0.3.0"
+    "imjoy-jupyter-extension >=0.3.0",
+    "aiohttp <4.0"
 ]
 lab = [
     "imjoy-jupyterlab-extension >=0.1.13",
-    "imjoy-elfinder[jupyter]"
+    "imjoy-elfinder[jupyter]",
+    "aiohttp <4.0"
 ]
 cli = [
     "hypha >= 0.15.28",