Fix bug in BindingsArray.__getitem__() (backport #11800)

[mergify]

This is an automatic backport of pull request #11800 done by Mergify.

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[coveralls]

Pull Request Test Coverage Report for Build 7907840850

Details

• 0 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 16 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.008%) to 89.197%

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Files with Coverage Reduction	New Missed Lines	%
crates/qasm2/src/lex.rs	4	91.69%
crates/qasm2/src/parse.rs	12	96.23%

Totals
Change from base Build 7907295920:	-0.008%
Covered Lines:	58822
Relevant Lines:	65946

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💛 - Coveralls