fish: drop lru downgrade from relax-deps.patch; Closes #1137655

Juan Manuel Méndez Reyrequested to merge
mendezr/fish:fish-lru-0.16-relax into master

fish 4.7.1 upstream uses lru = "0.16.2" in its workspace Cargo.toml; the existing debian/patches/relax-deps.patch downgrades that to "0.12" because lru 0.16 wasn't in Debian when the patch was written.

Now that we are going to upload rust-lru 0.16.4, we drop just that hunk and let upstream's "0.16.2" constraint stand.

There seems to be a pre-existing override_dh_auto_test failure (rand 0.9 to 0.10 API gaps) that is unrelated to this change and is already ignored by debian/rules (Error 101 (ignored)).

Closes: #1137655 (the bug I filed earlier in this transition).

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