Upgrade Lektor to 3.4.0b13 for Werkzeug 3.x compatibility

[Copilot]

Werkzeug 3.1.5 removed werkzeug.posixemulation, breaking Lektor 3.1.3 builds with ModuleNotFoundError.

Changes

• Upgrade Lektor from 3.1.3 → 3.4.0b13 (supports Werkzeug 3.x)
• Update pyproject.toml to require Lektor>=3.4.0b9
• Lock file changes:
  • exifread → pillow (image metadata)
  • watchdog → watchfiles (file watching)
  • Added marshmallow, python-slugify (new Lektor dependencies)

Lektor 3.4.0b9+ removed the werkzeug<2.4 pin that prevented upgrades.

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• astral.sh
  • Triggering command: /usr/bin/curl curl -LsSf REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[JoshKarpel]

lektor/lektor#1247 seems like lektor has not had a real release in a while, hence the funny version pin here

[edrogers]

Worth a shot