chore: update Django to 4.2.7 for Quince - Security Patch

[magajh]

Description

This PR updates Django to version 4.2.7 in the Quince release branch. The update includes the latest security patch, as part of the BTR working group's ongoing efforts to ensure the security of Open edX's supported named releases.

For more information, see: openedx/wg-build-test-release#324

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[itsjeyd]

Hey @magajh, thanks for the changes! It looks like they are ready for review, so I'm updating the status of this PR accordingly.

@mattcarter This is ready for engineering review by Aurora.

[itsjeyd]

Hey @mattcarter, a friendly ping about reviewing this PR.

CC @openedx/2u-aurora

[cmltaWt0]

Tested by local tutor build and full deploy (launch).
Merging.

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