Update maven_repositories url (#21056)
Update maven_repositories url (#21056)

Summary:
Update maven_repositories url to `https://dl.google.com/dl/android/maven2/` while the previous url `https://maven.google.com` has always been redirect to `https://dl.google.com/dl/android/maven2/`.
Pull Request resolved: https://github.com/facebook/react-native/pull/21056

Differential Revision: D9789079

Pulled By: hramos

fbshipit-source-id: 9907d46fe7356f5b710fa4a8b9a4b0903d732967

hammerandchisel/react-native,janicduplessis/react-native,hammerandchisel/react-native,exponentjs/react-native,javache/react-native,exponent/react-native,hoangpham95/react-native,myntra/react-native,javache/react-native,hoangpham95/react-native,facebook/react-native,hammerandchisel/react-native,exponent/react-native,myntra/react-native,pandiaraj44/react-native,pandiaraj44/react-native,myntra/react-native,myntra/react-native,janicduplessis/react-native,exponentjs/react-native,myntra/react-native,javache/react-native,arthuralee/react-native,hammerandchisel/react-native,exponentjs/react-native,arthuralee/react-native,pandiaraj44/react-native,javache/react-native,hoangpham95/react-native,myntra/react-native,arthuralee/react-native,hammerandchisel/react-native,exponent/react-native,pandiaraj44/react-native,javache/react-native,facebook/react-native,exponentjs/react-native,hoangpham95/react-native,javache/react-native,exponent/react-native,myntra/react-native,pandiaraj44/react-native,exponentjs/react-native,hammerandchisel/react-native,arthuralee/react-native,exponentjs/react-native,janicduplessis/react-native,exponentjs/react-native,hoangpham95/react-native,facebook/react-native,facebook/react-native,exponent/react-native,pandiaraj44/react-native,myntra/react-native,exponent/react-native,exponent/react-native,javache/react-native,javache/react-native,pandiaraj44/react-native,facebook/react-native,hoangpham95/react-native,hammerandchisel/react-native,facebook/react-native,arthuralee/react-native,pandiaraj44/react-native,facebook/react-native,facebook/react-native,janicduplessis/react-native,janicduplessis/react-native,hammerandchisel/react-native,exponent/react-native,janicduplessis/react-native,hoangpham95/react-native,janicduplessis/react-native,myntra/react-native,janicduplessis/react-native,javache/react-native,exponentjs/react-native,hoangpham95/react-native,facebook/react-native