fixup deps for forest/stable-rust-toolchain

[aatifsyed]

Summary of changes
Changes introduced in this pull request:

• remove fvm, it wasn't used in these crates at all. Surprised we don't check for unused deps with e.g cargo-udeps, which would have stopped this situation.
• bump fvm_shared

Reference issue to close (if applicable)

Closes

Other information and links

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[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (38903b4) 9.55% compared to head (7f33400) 9.55%.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #116   +/-   ##
=====================================
  Coverage   9.55%   9.55%           
=====================================
  Files        311     311           
  Lines      28695   28695           
=====================================
  Hits        2741    2741           
  Misses     25954   25954           

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[lemmih]

We are using cargo udeps but, unfortunately, it doesn't work well with workspaces.