net/url: don't permit a colon after the port

[callthingsoff]

Fixes #75223

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Patch Set 1:

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Patch Set 1: Commit-Queue+1

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Patch Set 1: -Commit-Queue

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Patch Set 1:

This CL has failed the run. Reason:

Tryjob golang/try/gotip-windows-amd64 has failed with summary (view all results):

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• go on master (change 700656)

To reproduce, try gomote repro 8704720414006010913.

Additional links for debugging:

• go tool dist test -json output [shard 4]

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Message from Jes Cok:

Patch Set 2: Commit-Queue+1

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Patch Set 2:

This CL has failed the run. Reason:

Tryjob golang/try/gotip-windows-386 has failed with summary (view all results):

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• go on master (change 700656)

To reproduce, try gomote repro 8704658470368766977.

Additional links for debugging:

• go tool dist test -json output [shard 1]

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Patch Set 2: Commit-Queue+1

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