Update actions-rust-lang/setup-rust-toolchain action to v1.15.1

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This PR contains the following updates:

Package	Type	Update	Change
actions-rust-lang/setup-rust-toolchain	action	patch	v1.15.0 -> v1.15.1

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Release Notes

actions-rust-lang/setup-rust-toolchain (actions-rust-lang/setup-rust-toolchain)

v1.15.1

Compare Source

What's Changed

• Bump Swatinem/rust-cache from 2.8.0 to 2.8.1 by @​dependabot[bot] in #​73

Full Changelog: actions-rust-lang/setup-rust-toolchain@v1.15.0...v1.15.1

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