Upgrade packse to 0.3.15

[zanieb]

Includes astral-sh/packse#179 for #3225

uv pip compile scripts/scenarios/requirements.in -o scripts/scenarios/requirements.txt --refresh-package packse --upgrade
cargo dev fetch-python
source .env
./scripts/sync_scenarios.sh

[konstin]

This needs a BUILD_VENDOR_LINKS_URL update too, should we add that to the script?

[zanieb]

Ah thanks for the note. We probably should!

[zanieb]

We could add a separate upgrade-packse script that runs the requirements update and does this replacement?

[ibraheemdev]

Looks good after BUILD_VENDOR_LINKS_URL is updated.