dashboard: update dragonfly to 6.4.0

[tuxillo]

Initial work to move from dfly 6.2.2 to 6.4.0.

For golang/go#64684.

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Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Message from Dmitri Shuralyov:

Patch Set 2: Code-Review+2 Commit-Queue+1

(1 comment)

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Message from Go LUCI:

Patch Set 2:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2023-12-12T17:15:12Z","revision":"6dddd6e159ea936225f588986c93324cffdde947"}

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Message from Dmitri Shuralyov:

Patch Set 2: Code-Review+1

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Message from Dmitri Shuralyov:

Patch Set 2: -Commit-Queue

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Message from Go LUCI:

Patch Set 2:

This CL has passed the run

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Message from Go LUCI:

Patch Set 2: LUCI-TryBot-Result+1

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Message from Dmitri Shuralyov:

Patch Set 4: Auto-Submit+1 Code-Review+2 Commit-Queue+1

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Message from Go LUCI:

Patch Set 4:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2023-12-12T20:15:39Z","revision":"2a89e5656c5132f36b82f523d9def73eb50b7f82"}

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Message from Dmitri Shuralyov:

Patch Set 4:

(2 comments)

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Message from Dmitri Shuralyov:

Patch Set 4: -Commit-Queue

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Message from Go LUCI:

Patch Set 4:

This CL has passed the run

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Message from Go LUCI:

Patch Set 4: LUCI-TryBot-Result+1

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This PR is being closed because golang.org/cl/549035 has been merged.