Revert "Pin WASM / packed SIMD tests to nightly-2022-01-17 (#1204)"

[alamb]

This reverts commit d68c4ae.

Which issue does this PR close?

Re #1198

Rationale for this change

Upstream issue rust-lang/packed_simd#341 seems to be resolved, so we can remove the pin and go back to using latest nightly for testing simd

What changes are included in this PR?

Revert #1204

Are there any user-facing changes?

No (CI only fix)

[codecov-commenter]

Codecov Report

Merging #1251 (ae5dec3) into master (aac1844) will increase coverage by 0.00%.
The diff coverage is n/a.

❗ Current head ae5dec3 differs from pull request most recent head dab9385. Consider uploading reports for the commit dab9385 to get more accurate results

@@           Coverage Diff           @@
##           master    #1251   +/-   ##
=======================================
  Coverage   82.96%   82.96%           
=======================================
  Files         178      178           
  Lines       51547    51547           
=======================================
+ Hits        42765    42767    +2     
+ Misses       8782     8780    -2     

Impacted Files	Coverage Δ
arrow/src/array/transform/mod.rs	84.77% <0.00%> (+0.12%)	⬆️
parquet_derive/src/parquet_field.rs	65.98% <0.00%> (+0.22%)	⬆️

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[jhorstmann]

Looks good. I saw the fix was announced on twitter