Bump node from 22.5.1-alpine to 22.6.0-alpine in /images/npm

[dependabot[bot]]

Bumps node from 22.5.1-alpine to 22.6.0-alpine.

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[coveralls]

coverage: 90.951%. remained the same when pulling fa6c7cacc5eed238cf25ab7f5537e4955ab7fa7f on dependabot/docker/images/npm/node-22.6.0-alpine into 2288fd15f9595e0af0e986c86a82b1cc5c9c6855 on mainline.

[dependabot[bot]]

Superseded by #337.