Duplicate URLs get fetched twice

[AustinSchuh]

If we have the following in our WORKSPACE file:

http_archive(
    name = "io_bazel_rules_go",
    sha256 = "a8d6b1b354d371a646d2f7927319974e0f9e52f73a2452d2b3877118169eb6bb",
    urls = [
        "https://github.com/bazelbuild/rules_go/releases/download/v0.23.3/rules_go-v0.23.3.tar.gz",
    ],
)

http_archive(
    name = "io_bazel_rules_go2",
    sha256 = "a8d6b1b354d371a646d2f7927319974e0f9e52f73a2452d2b3877118169eb6bb",
    urls = [
        "https://github.com/bazelbuild/rules_go/releases/download/v0.23.3/rules_go-v0.23.3.tar.gz",
    ],
)

(This is obviously silly, but we have legitimate use cases which end up evaluating to the same URL).

Bazel merrily downloads the same URL twice, and the UI alternates between showing status for one and showing status for the other.

Once it is in the local repository cache, this isn't an issue.

[github-actions]

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[AustinSchuh]

I'm unaware of any changes in this space that would fix this.