fix: pin Playwright to 1.46.0 to match Docker base image

The Docker image is based on mcr.microsoft.com/playwright/python:v1.46.0.
Using an open-ended dependency (playwright>=1.46.0) allowed newer
Playwright versions to be installed in CI, causing driver/browser
mismatches and bootstrap crashes (exit code 3).

Pinning Playwright to 1.46.0 ensures version consistency between
Python package and container image and fixes the docker-compose
E2E stack failure.

https://chatgpt.com/share/694afaed-7c1c-800f-a2da-ec8c06e6ebe1

pyproject.toml

@@ -12,7 +12,7 @@ authors = [{ name = "Kevin Veen-Birkenbach", email = "kevin@veen.world" }]
 license = { text = "MIT" }
 urls = { Homepage = "https://github.com/kevinveenbirkenbach/matomo-bootstrap" }
 
-dependencies = ["playwright>=1.46.0"]
+dependencies = ["playwright==1.46.0"]
 
 # Provides a stable CLI name for Nix + pip installs:
 [project.scripts]