chore(deps): bump wasmtime

[hanabi1224]

This PR upgrades wasmtime to v43 since MSRV requirement has been satisified by #2265

Tipset validation benchmark result:

master:
     Running benches/tipset-validation.rs (target/release/deps/tipset_validation-4fd72144423dc9a0)
Gnuplot not found, using plotters backend
Benchmarking tipset_validation/calibnet@3408952: Warming up for 3.0000 s
Warning: Unable to complete 100 samples in 5.0s. You may wish to increase target time to 49.6s, or reduce sample count to 10.
tipset_validation/calibnet@3408952
                        time:   [177.21 ms 179.84 ms 182.12 ms]
Found 10 outliers among 100 measurements (10.00%)
  5 (5.00%) low severe
  5 (5.00%) low mild
Benchmarking tipset_validation/mainnet@5709604: Warming up for 3.0000 s
Warning: Unable to complete 100 samples in 5.0s. You may wish to increase target time to 706.9s, or reduce sample count to 10.
tipset_validation/mainnet@5709604
                        time:   [784.90 ms 801.04 ms 817.74 ms]
Found 1 outliers among 100 measurements (1.00%)
  1 (1.00%) high mild
  
PR:
     Running benches/tipset-validation.rs (target/release/deps/tipset_validation-c0097f4e99d91623)
Benchmarking tipset_validation/calibnet@3408952: Warming up for 3.0000 s
Warning: Unable to complete 100 samples in 5.0s. You may wish to increase target time to 315.0s, or reduce sample count to 10.
tipset_validation/calibnet@3408952
                        time:   [180.49 ms 182.81 ms 184.82 ms]
Found 11 outliers among 100 measurements (11.00%)
  6 (6.00%) low severe
  4 (4.00%) low mild
  1 (1.00%) high mild
Benchmarking tipset_validation/mainnet@5709604: Warming up for 3.0000 s
Warning: Unable to complete 100 samples in 5.0s. You may wish to increase target time to 703.3s, or reduce sample count to 10.
tipset_validation/mainnet@5709604
                        time:   [801.28 ms 820.48 ms 840.24 ms]

[codecov-commenter]

Codecov Report

❌ Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.01%. Comparing base (a29674a) to head (9f2380b).

Files with missing lines	Patch %	Lines
fvm/src/syscalls/error.rs	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2268      +/-   ##
==========================================
- Coverage   77.02%   77.01%   -0.01%     
==========================================
  Files         143      143              
  Lines       14187    14187              
==========================================
- Hits        10927    10926       -1     
- Misses       3260     3261       +1     

Files with missing lines	Coverage Δ
fvm/src/engine/mod.rs	81.92% <100.00%> (ø)
fvm/src/machine/limiter.rs	100.00% <ø> (ø)
fvm/src/syscalls/error.rs	48.48% <33.33%> (-3.04%)	⬇️

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[rvagg]

I need a bit of time to walk through this one, I want to do a per-version check since 36 to double check