Dependency patch updates and 4.4.64 release

This patch release updates Fjell dependencies to their latest patch versions and finalizes the 4.4.64 version.

Dependency Updates

• Update @fjell/core from ^4.4.68 to ^4.4.69 (commit: "Bump Fjell dependency patch versions in package.json")
• Update @fjell/http-api from ^4.4.58 to ^4.4.59 (same commit)
• Update @fjell/logging from ^4.4.59 to ^4.4.60 (same commit)
• Update @fjell/registry from ^4.4.75 to ^4.4.76 (same commit)

Versioning

• Bump package.json version from 4.4.64-dev.0 to 4.4.64