Downgrade sysinfo to avoid too many open files bug

[ailisp]

located this happens after new sysinfo::System::new(): GuillaumeGomez/sysinfo#242; before it fixed there it looks okay for us to use previous version.

[codecov]

Codecov Report

Merging #1952 into staging will decrease coverage by 0.15%.
The diff coverage is 90.32%.

@@            Coverage Diff             @@
##           staging   #1952      +/-   ##
==========================================
- Coverage    86.65%   86.5%   -0.16%     
==========================================
  Files          167     167              
  Lines        31447   31460      +13     
==========================================
- Hits         27251   27214      -37     
- Misses        4196    4246      +50

Impacted Files	Coverage Δ
chain/chunks/src/types.rs	25% <ø> (ø)	⬆️
core/store/src/db.rs	87.7% <ø> (ø)	⬆️
runtime/near-vm-runner/src/prepare.rs	96.93% <100%> (-0.04%)	⬇️
chain/client/src/types.rs	82.03% <100%> (-0.09%)	⬇️
chain/client/src/info.rs	70% <100%> (-0.38%)	⬇️
runtime/near-vm-logic/src/logic.rs	93.9% <100%> (ø)	⬆️
runtime/near-vm-runner/src/runner.rs	95.74% <50%> (-2.04%)	⬇️
chain/chain/src/store.rs	88.35% <85.36%> (-0.1%)	⬇️
chain/chunks/src/lib.rs	93.82% <93.75%> (+0.14%)	⬆️
chain/client/src/client_actor.rs	86.53% <94.44%> (+0.4%)	⬆️
... and 34 more

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