Update licenses for PTs

Currently, we ship a license file in projects/browser/Bundle-Data/Docs-TBB/Licenses/PluggableTransports/LICENSE, but we haven't updated in it in a very long time (last time was 723c63a0).

We should probably update it, or even use the go-licenses tool to make sure we always generated an updated copy (I don't know if this tool needs to work online though).

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