v3 Actors Amt update

[austinabell]

Summary of changes
Changes introduced in this pull request:

• Updates Amt to new version
  • Testing with new vectors against https://github.com/austinabell/go-amt-ipld/tree/updbsstats
  • Fuzz tested
  • Benchmarks below
  • Added changelog

Benchmark results

No features enabled (caching efficiency the same)

AMT bulk insert (no flush)
                        time:   [29.195 us 29.709 us 30.292 us]
                        change: [-1.2843% +0.8328% +2.8696%] (p = 0.44 > 0.05)
                        No change in performance detected.
Found 17 outliers among 100 measurements (17.00%)
  5 (5.00%) high mild
  12 (12.00%) high severe

AMT bulk insert with flushing and loading
                        time:   [592.92 us 602.70 us 614.00 us]
                        change: [-13.794% -11.543% -9.2613%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 13 outliers among 100 measurements (13.00%)
  4 (4.00%) high mild
  9 (9.00%) high severe

AMT initialization from slice
                        time:   [85.129 us 86.236 us 87.617 us]
                        change: [-0.5285% +2.8561% +7.0129%] (p = 0.13 > 0.05)
                        No change in performance detected.
Found 13 outliers among 100 measurements (13.00%)
  11 (11.00%) high mild
  2 (2.00%) high severe

AMT for_each function   time:   [46.364 us 47.120 us 48.033 us]
                        change: [+20.836% +23.095% +25.721%] (p = 0.00 < 0.05)
                        Performance has regressed.
Found 10 outliers among 100 measurements (10.00%)
  3 (3.00%) high mild
  7 (7.00%) high severe

Half of #959

Reference issue to close (if applicable)

Closes

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