clippy: Uses .into() when .try_into() is infallible

[brooksprumo]

Problem

There are nightly clippy warnings that will prevent upgrading our stable Rust version.

For this PR, it's this one: https://rust-lang.github.io/rust-clippy/master/index.html#/try_into

Summary of Changes

Replaces .try_into() with .into().

[brooksprumo]

@samkim-crypto This fix was auto-suggested by clippy. Want to double check with you to ensure it is safe.

[codecov]

Codecov Report

Merging #34049 (62951cd) into master (47a98eb) will decrease coverage by 0.1%.
Report is 3 commits behind head on master.
The diff coverage is 100.0%.

@@            Coverage Diff            @@
##           master   #34049     +/-   ##
=========================================
- Coverage    81.9%    81.9%   -0.1%     
=========================================
  Files         811      811             
  Lines      219552   219552             
=========================================
- Hits       179902   179893      -9     
- Misses      39650    39659      +9     

[samkim-crypto]

Yes, looks good to me, thanks!