Avoid ambiguity warning in getindex for LanczosJacobiBand

[dlfivefifty]

No description provided.

[codecov]

Codecov Report

Merging #15 (e974fc9) into main (cd41669) will increase coverage by 0.27%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
+ Coverage   82.16%   82.43%   +0.27%     
==========================================
  Files          11       11              
  Lines        1110     1110              
==========================================
+ Hits          912      915       +3     
+ Misses        198      195       -3     

Impacted Files	Coverage Δ
src/lanczos.jl	83.80% <100.00%> (+2.11%)	⬆️

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