fix: Use correct Python package name

Author: ktaletsk

install.json

@@ -1,5 +1,5 @@
 {
   "packageManager": "python",
-  "packageName": "jupyterlab_latex",
-  "uninstallInstructions": "Use your Python package manager (pip, conda, etc.) to uninstall the package jupyterlab_latex"
+  "packageName": "jupyterlab-latex",
+  "uninstallInstructions": "Use your Python package manager (pip, conda, etc.) to uninstall the package jupyterlab-latex"
 }