Update rust-ini requirement from 0.19 to 0.20

Updates the requirements on [rust-ini](https://github.com/zonyitoo/rust-ini) to permit the latest version.
- [Release notes](https://github.com/zonyitoo/rust-ini/releases)
- [Commits](zonyitoo/rust-ini@v0.19.0...v0.20.0)

---
updated-dependencies:
- dependency-name: rust-ini
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.toml

@@ -33,7 +33,7 @@ async-trait = { version = "0.1.50", optional = true }
 toml = { version = "0.8", optional = true }
 serde_json = { version = "1.0.2", optional = true }
 yaml-rust = { version = "0.4", optional = true }
-rust-ini = { version = "0.19", optional = true }
+rust-ini = { version = "0.20", optional = true }
 ron = { version = "0.8", optional = true }
 json5_rs = { version = "0.4", optional = true, package = "json5" }
 indexmap = { version = "2.0.0", features = ["serde"], optional = true }