Code quality cleanup

[dkarrasch]

This PR contains a few small edits that should be backported to v1.10.

• resolve a method ambiguity in a rare case (previously, we didn't check method ambiguity because there was no way to distinguish the methods in the sysimage from those same in this package)
• apparently, an update of Aqua.jl allows us to tighten some code quality checks

[codecov]

Codecov Report

Merging #438 (a8271b4) into main (4e6776a) will increase coverage by 0.76%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #438      +/-   ##
==========================================
+ Coverage   92.42%   93.19%   +0.76%     
==========================================
  Files          12       12              
  Lines        7667     7667              
==========================================
+ Hits         7086     7145      +59     
+ Misses        581      522      -59     

Files Changed	Coverage Δ
src/linalg.jl	91.56% <100.00%> (+4.56%)	⬆️

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[matbesancon]

good to merge?