chore(deps): update dependency ghost to v6.64.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
ghost (source)	6.63.0 → 6.64.0

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Release Notes

TryGhost/Ghost (ghost)

v6.64.0

Compare Source

• 🎨 Updated Source to v1.7.5 - Ghost CI
• 🐛 Fixed navigation icons failing to save on local installs (#​30476) - Austin Burdine
• 🐛 Fixed email rendering crashes on malformed CSS in post content (#​30769) - Austin Burdine
• 🐛 Fixed members being subscribed to all newsletters when choosing none (#​30708) - Austin Burdine
• 🐛 Fixed missing audit log entries for staff token changes (#​30701) - Austin Burdine
• 🐛 Fixed settings import overwriting protected core settings (#​30694) - Austin Burdine

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View the changelog for full details: TryGhost/Ghost@v6.63.0...v6.64.0

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