chore(master): release 2.9.0

:robot: I have created a release beep boop

duplicate create actions (#334) (354c530)
error when opening files from floating oil window (#355) (2bc56ad)
git mv errors when moving empty directory (#358) (6a7a10b)
gracefully handle new dirs with trailing backslash on windows (#336) (be0a1ec)
icon column highlight parameter (#366) (752563c)
race condition when entering oil buffer (#321) (c86e484)
ssh: bad argument when editing files over ssh (#370) (aa0c00c)
ssh: config option to pass extra args to SCP (#340) (3abb607)
ssh: garbled output when directory has broken symlinks (bcfc0a2)
support visual mode when preview window is open (#315) (f41d7e7)
windows: convert posix paths before matching LSP watch globs (#374) (f630887)
windows: file operation preview uses only backslash path separator (#336) (96f0983)
windows: navigating into drive letter root directories (#341) (f3a31eb)
windows: treat both backslash and frontslash as path separators (#336) (3b3a6b2)

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