Fix release script inconsistency

[dmerand]

What

Fix pnpm post-release so it can create the notification PR consistently.

Why

During the 3.93.1 patch release, post-release created the homebrew and docs PRs but failed on the notification step. bin/create-notification-pr.js was executed by bash instead of Node, which produced misleading import output and a shell syntax error.

How

• add the missing Node shebang to bin/create-notification-pr.js
• invoke the post-release helper scripts with node ... instead of relying on direct execution

Testing

From a clean stable/3.x checkout, run:

pnpm post-release

Verify that:

• the homebrew PR step runs
• the docs PR step runs
• the notification PR step runs without shell parse errors

[dmerand]

• Fix release script inconsistency #7207 👈 (View in Graphite)
• main

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[craigmichaelmartin]

Thanks!