ci: pin npm major in release workflow

[maithri471]

Problem

The Release workflow failed on the @nylas/react 3.2.13 release (run 29867901325):

npm error engine Not compatible with your version of node/npm: npm@12.0.1
npm error notsup Required: {"node":"^22.22.2 || ^24.15.0 || >=26.0.0"}
npm error notsup Actual:   {"npm":"10.9.0","node":"v22.12.0"}

npm install -g npm@latest now resolves to npm@12, which requires a newer Node than the pinned NODE_VERSION (22.12.0). Every release fails until this is fixed — deterministic, not flaky.

Fix

Pin the npm major (npm@11) so latest drift can't break releases. Alternative considered: bumping the NODE_VERSION repo variable — that also works but changes the build/publish runtime for all jobs and only defers the next latest breakage.

Context

This is blocking the release of @nylas/react@3.2.13 (#85 — web-elements 2.5.15 with the HeliosX Scheduler Editor availability fixes, nylas/nylas#957 + #958). Once merged, the Release workflow needs a re-run on main to resume the changesets flow.

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