upgrade packages in a11y image and add codeserver to check their a11y…

… extension

environment.yml

@@ -24,15 +24,18 @@ dependencies:
 - websockify==0.11.0
 - pip==23.0.1
 - jupyterthemes==0.20.0
-- jupyterlab-accessible-themes==0.1.1
-- jupyterlab_pygments==0.2.2
+- jupyterlab-accessible-themes==0.2.0
+- jupyterlab_pygments==0.3.0
+# Install Code Server to test codeserver specific a11y extensions
+- jupyter-vscode-proxy==0.6
+- code-server==4.23.1
 - pip:
   #- -r infra-requirements.txt
   # Upgrade separate from what everyone else uses for now
   # https://github.com/berkeley-dsep-infra/datahub/issues/3693
-  - notebook==7.1.0a1
-  - jupyterlab==4.1.0b0
-  - nbconvert-a11y==2023.12.6
+  - notebook==7.3.0a1
+  - jupyterlab==4.3.0b1
+  - nbconvert-a11y==2023.03.25
   - nb2pdf==0.6.2
   - nbpdfexport==0.2.1
   - jupyterlab-a11y-checker==0.1.2