cargo check fixes for beta (1.65)

[luizirber]

Nightly Rust checks started failing because next stable (1.65, current beta) turns more needless borrows into erros (similar to #1636)

[codecov]

Codecov Report

Merging #2298 (57dfcea) into latest (c202b6b) will increase coverage by 0.01%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           latest    #2298      +/-   ##
==========================================
+ Coverage   84.82%   84.84%   +0.01%     
==========================================
  Files         131      131              
  Lines       15676    15673       -3     
  Branches     2251     2251              
==========================================
  Hits        13297    13297              
+ Misses       2085     2082       -3     
  Partials      294      294              

Flag	Coverage Δ
python	92.14% <ø> (ø)
rust	65.34% <33.33%> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/core/src/index/linear.rs	17.64% <0.00%> (ø)
src/core/src/index/revindex.rs	33.90% <25.00%> (ø)
src/core/src/index/sbt/mod.rs	66.76% <100.00%> (ø)
src/core/src/ffi/signature.rs	0.00% <0.00%> (ø)

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