Bump async from 2.6.3 to 2.6.4 in /packages/starboard-notebook

Bumps [async](https://github.com/caolan/async) from 2.6.3 to 2.6.4.
- [Release notes](https://github.com/caolan/async/releases)
- [Changelog](https://github.com/caolan/async/blob/v2.6.4/CHANGELOG.md)
- [Commits](caolan/async@v2.6.3...v2.6.4)

---
updated-dependencies:
- dependency-name: async
  dependency-type: indirect
...

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

packages/starboard-notebook/yarn.lock

@@ -2052,9 +2052,9 @@ astral-regex@^2.0.0:
   integrity sha512-Z7tMw1ytTXt5jqMcOP+OQteU1VuNK9Y02uuJtKQ1Sv69jXQKKg5cibLwGJow8yzZP+eAc18EmLGPal0bp36rvQ==
 
 async@^2.6.2:
-  version "2.6.3"
-  resolved "https://registry.yarnpkg.com/async/-/async-2.6.3.tgz#d72625e2344a3656e3a3ad4fa749fa83299d82ff"
-  integrity sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==
+  version "2.6.4"
+  resolved "https://registry.yarnpkg.com/async/-/async-2.6.4.tgz#706b7ff6084664cd7eae713f6f965433b5504221"
+  integrity sha512-mzo5dfJYwAn29PeiJ0zvwTo04zj8HDJj0Mn8TD7sno7q12prdbnasKJHhkm2c1LgrhlJ0teaea8860oxi51mGA==
   dependencies:
     lodash "^4.17.14"
 
@@ -6371,10 +6371,10 @@ pvutils@latest:
   resolved "https://registry.yarnpkg.com/pvutils/-/pvutils-1.0.17.tgz#ade3c74dfe7178944fe44806626bd2e249d996bf"
   integrity sha512-wLHYUQxWaXVQvKnwIDWFVKDJku9XDCvyhhxoq8dc5MFdIlRenyPI9eSfEtcvgHgD7FlvCyGAlWgOzRnZD99GZQ==
 
-pyodide@^0.18.1:
-  version "0.18.2"
-  resolved "https://registry.yarnpkg.com/pyodide/-/pyodide-0.18.2.tgz#6c2dbfcac3f0a5f6e2bd5d2d2766aea50e4c29f0"
-  integrity sha512-t4Mi75oDHc3NPmF8CjpiQ6/oMrxzT7ktv0WAyCnM4PcVG4uQ5bce3jZpeOQhrbUWUYhx3clwhsSGj9JawMm3Ug==
+pyodide@^0.20.0:
+  version "0.20.0"
+  resolved "https://registry.yarnpkg.com/pyodide/-/pyodide-0.20.0.tgz#05ca12eb2f8a04e04de1402955d0f9793bcb5537"
+  integrity sha512-15fov4N0QUWmzCAC9vsYJMA8n1u/vsVH1QLczkMa4fKepcm8PhTqKPOtdbd6tKkMvHE5s3X/PcvJ7sHHdkGvNQ==
   dependencies:
     base-64 "^1.0.0"
     node-fetch "^2.6.1"
@@ -6985,14 +6985,14 @@ stack-utils@^2.0.3:
   dependencies:
     escape-string-regexp "^2.0.0"
 
-starboard-python@^0.15.4:
-  version "0.15.4"
-  resolved "https://registry.yarnpkg.com/starboard-python/-/starboard-python-0.15.4.tgz#c48cde8cf2260cfc7810d2948499f4755ceee05f"
-  integrity sha512-sLeK+7LkJcEMrkOGzCHxycG60mQfWOyRD3BuQqsNehNUQtGF3li/vbPnHD6b9iSRlpw2r1CYbR6P+KnbkWQnYA==
+starboard-python@^0.15.6:
+  version "0.15.6"
+  resolved "https://registry.yarnpkg.com/starboard-python/-/starboard-python-0.15.6.tgz#2a750f7000c270479cd21d8d8fd98e25acbf78ba"
+  integrity sha512-5008tHn/MDdZK+gsZ20WMA0Cg55zClmNdY8KuPSJg/AUMpgqPjSWpHpRyC9B7gBNkiCZJ+YHbtbmq+RAIqDAow==
   dependencies:
     "@types/katex" "^0.11.1"
     lit "^2.0.2"
-    pyodide "^0.18.1"
+    pyodide "^0.20.0"
 
 starboard-rich-editor@^0.15.2:
   version "0.15.2"