Update lint-npm_package to specify package.json

The current script is npmPkgJsonLint ., which will lint all package.json files in the current directory and subdirectories. This creates an issue for any module that has test package.json files that may not meet the linting standards.

Update to:

variables:
  PACKAGE_PATH: "./package.json"
script:
  - npmPkgJsonLint $PACKAGE_PATH

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