Updated JupyterLab Classifier to JupyterLab 4, Bump actions/cache to v3 (#576)

* Ft: Updated JupyterLab 4 Classifier

* Updated actions/cache for e2e Tests to v3

---------

Co-authored-by: Astitv Shandilya <astitv-sh@gmail.com>

Author: astitv-sh

.github/workflows/e2e-tests.yml

@@ -49,7 +49,7 @@ jobs:
         run: jlpm install
 
       - name: Set up browser cache
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: |
             ${{ github.workspace }}/pw-browsers

pyproject.toml

@@ -12,11 +12,11 @@ requires-python = ">=3.9"
 authors = [
     { name = "Project Jupyter" },
 ]
-keywords = ["Jupyter", "JupyterLab", "JupyterLab3"]
+keywords = ["Jupyter", "JupyterLab", "JupyterLab4"]
 classifiers = [
     "Framework :: Jupyter",
     "Framework :: Jupyter :: JupyterLab",
-    "Framework :: Jupyter :: JupyterLab :: 3",
+    "Framework :: Jupyter :: JupyterLab :: 4",
     "Framework :: Jupyter :: JupyterLab :: Extensions",
     "Framework :: Jupyter :: JupyterLab :: Extensions :: Prebuilt",
     "License :: OSI Approved :: BSD License",