Update orjson to ~=3.9.15 to address security issue.

[whyitfor]

• [x] I have reviewed the OFRAK contributor guide and attest that this pull request is in accordance with it.

One sentence summary of this PR (This should go in the CHANGELOG!) Bump orjson to ~=3.9.15.

Link to Related Issue(s) See https://github.com/redballoonsecurity/ofrak/security/dependabot/19.

Please describe the changes in your request. See above.

Anyone you think should look at this, specifically? No.