Add Phishing Detection Data Update Script

[not-a-rootkit]

Task/Issue URL: https://app.asana.com/0/1204023833050360/1208270234071172/f
Tech Design URL: https://app.asana.com/0/481882893211075/1207483114414814
CC:

Description:
In ✓ Tech Design: Phishing Protection Data Updates we defined an approach to get embedded data for phishing protection into the app builds. This pattern was implemented, but two small components still need merging:
The update script:
A small bash script that pulls data from the API into the repo in JSON format, and updates the checksums + revision values in PhishingDetection.swift .
This has already been implemented, it just needs testing and merging:

A GitHub Action workflow that executes this script once a week and creates a PR that merges this data into the new release build.
Example Script
The secrets and workflow have already been defined, it just needs to be tested and merged.

Steps to test this PR:

1. Execute bash scripts/update_phishing_detection_data.sh
2. Ensure it succeeds
3. Check git, validate that the version has been updated to a higher version, and SHA hashes were updated in ./DuckDuckGo/PhishingDetection/PhishingDetection.swift

Definition of Done:

• Does this PR satisfy our Definition of Done?

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Internal references:

Pull Request Review Checklist
Software Engineering Expectations
Technical Design Template
Pull Request Documentation

[github-actions]

	Warnings
⚠️	PR has more than 500 lines of code changing. Consider splitting into smaller PRs if possible.

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