snapcraft: fix series24 using python-packages

In Snapcraft documentation about the python plugin[1], it is told that
"If the source contains a setup.py or pyproject.toml file, those files
are used to install the dependencies specified by the package itself."

Because of this, the request_unixsocket2 package is being pulled, and it
requires urllib3 2.4 or highed. However, the Debian stage package
python3-requests-oauthlib also pulls urllib3, but it's the version from
the Debian archives, which is 2.0.7. Because of this, pip tries to
uninstall the old version and fails (because it's a Debian install).

Replacing the python3-requests-oauthlib stage package with
requests-oauthlib python package fixes the build issue.

[1]:
https://documentation.ubuntu.com/snapcraft/latest/reference/plugins/python_plugin/#how-it-works

Author: pieqq

checkbox-core-snap/series24/snap/snapcraft.yaml

@@ -244,7 +244,6 @@ parts:
       - python3-jinja2
       - python3-packaging
       - python3-pyparsing
-      - python3-requests-oauthlib
       - python3-urwid
       - python3-xlsxwriter
       # added to stage python:
@@ -260,6 +259,8 @@ parts:
       - python3.12-minimal
       - python3-yaml
     python-packages:
+      - requests-oauthlib
+      - requests-unixsocket
       - tqdm
       - picamera # p-p-c dep that wouldnt install in another part
     after: [checkbox-support]