Update by running: npm i --package-lock-only

According to
https://docs.npmjs.com/cli/v8/configuring-npm/package-lock-json#lockfileversion
lockfileVersion 2 is backwards compatible with 1 but adds extra metadata
to aid with performance and reproducible builds.

Additionally, swagger-ui already uses lockfileVersion 2 in its
package-lock.json.

deep-extend does not support array merge. There was special code added
to merge top-level arrays, but that was a shallow merge.

Use deepmerge instead of deep-extend to merge arrays also. Default merge
settings seem to work well - all tests pass.

Extend all-of merge test case based on
swagger-api/swagger-ui#7618

Fixes: 2f5bb86 ("Fix and test for swagger-ui swagger-api#3328: swagger-api/swagger-ui#3328. Added manual logic to merge arrays after calling deepExtend within `mergeDeep` function")