chore: bump spring-shell-e2e dependencies

- Bump node-pty from 0.11.0-beta19 to 1.0.0
- Bump xterm-headless from 4.18.0 to 5.5.0
- Rename xterm-headless to @xterm/headless as per https://www.npmjs.com/package/xterm-headless
- Unpin Python 3.11 in e2e test by reverting commit 8097f1eb91 because it's no longer necessary as explained in https://github.com/spring-projects/spring-shell/issues/909#issuecomment-2188962147

- Fixes https://github.com/spring-projects/spring-shell/issues/909
- Fixes https://github.com/spring-projects/spring-shell/issues/921

e2e/spring-shell-e2e/package.json

@@ -36,7 +36,7 @@
     "typescript": "^4.6.4"
   },
   "dependencies": {
-    "node-pty": "0.11.0-beta19",
-    "xterm-headless": "^4.18.0"
+    "node-pty": "^1.0.0",
+    "@xterm/headless": "^5.5.0"
   }
 }