`remap_paths` in `pkg_tar` is not applied to `deps`

Reproduction example:
```starlark
# BUILD.bazel

load("@rules_pkg//:pkg.bzl", "pkg_tar")

pkg_tar(
name = "pkg",
srcs = ["//foo:file.txt"], # results in bar/file.txt
remap_paths = {
"foo": "bar",
},
strip_prefix = "/",
deps = ["//foo"], # results in foo/file.txt
)

# foo/BUILD.bazel

load("@rules_pkg//:pkg.bzl", "pkg_tar")

exports_files(["file.txt"])

pkg_tar(
name = "foo",
srcs = [":file.txt"],
strip_prefix = "/",
visibility = ["//visibility:public"],
)
```

```
$ bazel build //:pkg.tar && tar tvf bazel-bin/pkg.tar
drwxr-xr-x 0/0 0 2000-01-01 00:00 bar/
-r-xr-xr-x 0/0 0 2000-01-01 00:00 bar/file.txt
drwxr-xr-x 0/0 0 2000-01-01 00:00 foo/
-r-xr-xr-x 0/0 0 2000-01-01 00:00 foo/file.txt
```

Start by running the BUILD.bazel reproduction with `bazel build //:pkg.tar` and inspecting the `pkg_tar` implementation loaded from `@rules_pkg//:pkg.bzl`. Compare how `srcs` and `deps` are mapped into the archive. Done means the dependency file follows `remap_paths` and the resulting tar contains `bar/file.txt` rather than an additional `foo/file.txt`.

Written by the indexing model from the issue text.