fix(release): release process was broken by recent change removing .npmrc file

[trentm]

Refs: #5178

---

The release process fail was in make-distribution.sh.
E.g. from https://github.com/elastic/apm-agent-nodejs/actions/runs/31650818983/job/94294550321

Run make -C .ci dist
make: Entering directory '/home/runner/work/apm-agent-nodejs/apm-agent-nodejs/.ci'
../dev-utils/make-distribution.sh
elastic-apm-node-4.18.0.tgz
cp: cannot stat '/home/runner/work/apm-agent-nodejs/apm-agent-nodejs/.npmrc': No such file or directory
make: *** [Makefile:20: dist] Error 1
make: Leaving directory '/home/runner/work/apm-agent-nodejs/apm-agent-nodejs/.ci'
Error: Process completed with exit code 2.

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