notify-slack-action: dependencies installed clean, install scripts off

npm install --ignore-scripts --no-audit --no-fund --no-update-notifier finished with exit 0 in 7 seconds, adding 531 packages.

We cloned the repository at commit 7110b97dd758 and ran it under sandbox-exec -- (deny default) after importing the base BSD profile, reads allowed only under the system and toolchain paths and the scratch directory, writes confined to that scratch directory, the environment replaced with env -i, and lifecycle scripts disabled. The user's home directory is on no allow list. Node v26.7.0, npm 11.19.0. We did not run the bot: this is an observation about whether its dependencies resolve on that day, on that toolchain, and nothing more.