Harden CI supply chain and add grouped Dependabot config#300

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vpetersson wants to merge 7 commits into

chore/dependabot-grouped-updates

Commits on Jul 20, 2026

Add dependabot config to group dependency update PRs

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Replace unmaintained actions-rs/clippy-check with cargo clippy

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Pin all third-party actions to commit SHAs

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Replace dtolnay/rust-toolchain with rustup in docs and release

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Use stable rustfmt and stop failing lint on clippy warnings

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Fix redundant references in formatting macros

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Upgrade remaining outdated actions

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