Back to future-locks 0.6

[travisbrown]

We were relying on a bug in 0.6 that was fixed in 0.7. I need to take a closer look at this, but the bug never actually caused problems for us, so I'm just reverting the version for now.

[codecov-commenter]

Codecov Report

Merging #51 (cb3e7e6) into main (83e3b37) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main      #51   +/-   ##
=======================================
  Coverage   25.26%   25.26%           
=======================================
  Files          45       45           
  Lines        2909     2909           
=======================================
  Hits          735      735           
  Misses       2174     2174           

Impacted Files	Coverage Δ
src/wbm/downloader.rs	0.00% <ø> (ø)
src/wbm/tweet/mod.rs	0.00% <0.00%> (ø)

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