fix: Run tests without depending on openssl

[polarathene]

reqwest is only used for a crate example basic HTTP call:

config-rs/examples/async_source/main.rs

Line 61 in 1483f4c

reqwest::get(&self.uri)

When cloning the project repo and running tests, it'd fail without OpenSSL devel package present on the system to build reqwest. I was going to replace that with rusttls but it seems HTTPS isn't required at all so opt-out of default features seems more prudent?

[coveralls]

Pull Request Test Coverage Report for Build 17283859396

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 65.259%

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Totals
Change from base Build 17104337609:	0.0%
Covered Lines:	958
Relevant Lines:	1468

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💛 - Coveralls

[epage]

Fine with this change. CI needs addressing

[polarathene]

CI needs addressing

Is there a preferred way to update Cargo.lock? Or just cargo update is ok for this project? Does that need to be run from Rust 1.75, or can it be done from a newer toolchain?

Some of the other Cargo.toml deps could probably be updated given the Rust 1.75 MSRV which would remove some duplicate crates, warp@0.3 for example could go to warp@0.4. It's also a dev-dependency but I'm not sure if you'd want it bundled in this PR or not? (if so do you want it all in a single commit?)

[epage]

Run cargo check and commit amend your commit.