Update http://mirror.bazel.build references to https.
Update http://mirror.bazel.build references to https.

bazelbuild/rules_scala,smparkes/rules_scala,smparkes/rules_scala,smparkes/rules_scala,ianoc/rules_scala,bazelbuild/rules_scala,ianoc/rules_scala,bazelbuild/rules_scala,ianoc/rules_scala