Reverted 'static constraint on T in Vec<T> and [T; N]

[VictorKoenders]

Reverted this change as there was a regression as mentioned in #619 (review)

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.67% 🎉

Comparison is base (2f08107) 56.33% compared to head (7b484c1) 57.01%.

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk     #663      +/-   ##
==========================================
+ Coverage   56.33%   57.01%   +0.67%     
==========================================
  Files          51       51              
  Lines        4317     4306      -11     
==========================================
+ Hits         2432     2455      +23     
+ Misses       1885     1851      -34     

Files Changed	Coverage Δ
src/features/impl_alloc.rs	61.83% <ø> (-1.08%)	⬇️
src/de/impls.rs	65.91% <100.00%> (+3.41%)	⬆️
tests/std.rs	97.67% <100.00%> (+0.14%)	⬆️

... and 4 files with indirect coverage changes

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