Bump MSRV to 1.64

[Xuanwo]

Read more detail at #1609

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.08 ⚠️

Comparison is base (bc0718f) 29.58% compared to head (e7fffe1) 29.51%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1649      +/-   ##
==========================================
- Coverage   29.58%   29.51%   -0.08%     
==========================================
  Files          49       49              
  Lines       17030    17030              
  Branches     8209     8198      -11     
==========================================
- Hits         5039     5027      -12     
+ Misses       6997     6994       -3     
- Partials     4994     5009      +15     

see 13 files with indirect coverage changes

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[Xuanwo]

freebsd tests seems always failed since e534072

[sylvestre]

freebsd tests seems always failed since e534072

Let's see:
#1651

[sylvestre]

sorry, it needs to be rebased

[Xuanwo]

sorry, it needs to be rebased

DONE

[sylvestre]

I am wondering if we should not wait after we released 0.4.0 before merging this

[Xuanwo]

I am wondering if we should not wait after we released 0.4.0 before merging this

It's more common to bump MSRV when bumping minor releases. But both LGTM.