Safer std::vector indexing (backport #1769)

[mergify]

This is an automatic backport of pull request #1769 done by Mergify.
Cherry-pick of 76e3137 has failed:

On branch mergify/bp/main/pr-1769
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Changes to be committed:
	modified:   samples/addmoddel.cpp
	modified:   samples/exiv2json.cpp
	modified:   src/exiv2.cpp
	modified:   src/minoltamn_int.cpp
	modified:   src/properties.cpp
	modified:   src/sigmamn_int.cpp
	modified:   src/tiffvisitor_int.cpp
	modified:   src/types.cpp
	modified:   src/utils.cpp
	modified:   src/xmp.cpp
	modified:   src/xmpsidecar.cpp

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   src/actions.cpp
	both modified:   src/basicio.cpp
	both modified:   src/convert.cpp
	both modified:   src/tags_int.cpp
	both modified:   src/value.cpp

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[codecov]

Codecov Report

Merging #1786 (637a765) into main (6373fe3) will increase coverage by 0.02%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##             main    #1786      +/-   ##
==========================================
+ Coverage   67.49%   67.51%   +0.02%     
==========================================
  Files         151      151              
  Lines       20815    20868      +53     
==========================================
+ Hits        14050    14090      +40     
- Misses       6765     6778      +13     

Impacted Files	Coverage Δ
src/tiffvisitor_int.cpp	87.51% <ø> (ø)
src/actions.cpp	74.03% <36.36%> (-0.11%)	⬇️
samples/addmoddel.cpp	88.67% <100.00%> (ø)
samples/exiv2json.cpp	75.60% <100.00%> (ø)
src/basicio.cpp	56.68% <100.00%> (ø)
src/exiv2.cpp	66.03% <100.00%> (ø)
src/minoltamn_int.cpp	59.13% <100.00%> (ø)
src/properties.cpp	80.09% <100.00%> (ø)
src/sigmamn_int.cpp	69.56% <100.00%> (ø)
src/tags_int.cpp	87.20% <100.00%> (ø)
... and 10 more

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