Update rust-ini requirement from 0.18 to 0.19 in /backend

[dependabot[bot]]

Updates the requirements on rust-ini to permit the latest version.

Release notes

Sourced from rust-ini's releases.

v0.19.0

What's Changed

• Update README.rst by @​Zamiell in zonyitoo/rust-ini#87
• Don't panic (on general section for empty ini) by @​sirhcel in zonyitoo/rust-ini#88
• Fix typo by @​SebastienGllmt in zonyitoo/rust-ini#89
• Fix failing test when building with --all-features by @​joshuachp in zonyitoo/rust-ini#92
• Add configurable separator by @​2m in zonyitoo/rust-ini#93
• Fix reported line/column numbers in error message by @​Chocobo1 in zonyitoo/rust-ini#95
• Add test case for ParseError line/column numbers by @​Chocobo1 in zonyitoo/rust-ini#97
• Skip over tab characters before comment delimiter by @​Chocobo1 in zonyitoo/rust-ini#98
• fix: CI on a supported platform by @​ryanwohara in zonyitoo/rust-ini#99
• Improve test coverage for escape_str() function by @​rhi-gray in zonyitoo/rust-ini#102
• bump ordered-multimap to 0.6 by @​xxchan in zonyitoo/rust-ini#103

New Contributors

• @​Zamiell made their first contribution in zonyitoo/rust-ini#87
• @​sirhcel made their first contribution in zonyitoo/rust-ini#88
• @​SebastienGllmt made their first contribution in zonyitoo/rust-ini#89
• @​joshuachp made their first contribution in zonyitoo/rust-ini#92
• @​2m made their first contribution in zonyitoo/rust-ini#93
• @​Chocobo1 made their first contribution in zonyitoo/rust-ini#95
• @​ryanwohara made their first contribution in zonyitoo/rust-ini#99
• @​rhi-gray made their first contribution in zonyitoo/rust-ini#102
• @​xxchan made their first contribution in zonyitoo/rust-ini#103

Full Changelog: https://github.com/zonyitoo/rust-ini/compare/v0.18.0...v0.19.0

Commits

• 2795581 release v0.19.0
• 6438946 bump ordered-multimap to 0.6
• a711807 Improve test coverage for escape_str() function
• f27b66d enable clippy check
• 68203bb github build status
• c5feed2 switch from circleci to github action
• 5ca5f5d fix: CI on a supported platform
• 641bb49 Skip over tab characters before comment delimiter
• c24389a inline-comments should starts with a ' '
• f7b31cb Add test case for ParseError line/column numbers
• Additional commits viewable in compare view

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