Bump DeterminateSystems/magic-nix-cache-action from 8 to 9#81

Bumps [DeterminateSystems/magic-nix-cache-action](https://github.com/determinatesystems/magic-nix-cache-action) from 8 to 9. <details> <summary>Release notes</summary> <p><em>Sourced from <a href="https://github.com/determinatesystems/magic-nix-cache-action/releases">DeterminateSystems/magic-nix-cache-action's releases</a>.</em></p> <blockquote> <h2>v9</h2> <h2>What's Changed</h2> <ul> <li>ci workflow: don't check initial substituter list by <a href="https://github.com/colemickens"><code>@​colemickens</code></a> in <a href="https://redirect.github.com/DeterminateSystems/magic-nix-cache-action/pull/90">DeterminateSystems/magic-nix-cache-action#90</a></li> <li>Matrix by <a href="https://github.com/grahamc"><code>@​grahamc</code></a> in <a href="https://redirect.github.com/DeterminateSystems/magic-nix-cache-action/pull/96">DeterminateSystems/magic-nix-cache-action#96</a></li> <li>Update <code>detsys-ts</code>: Merge pull request <a href="https://redirect.github.com/determinatesystems/magic-nix-cache-action/issues/69">#69</a> from DeterminateSystems/update-deps by <a href="https://github.com/detsys-pr-bot"><code>@​detsys-pr-bot</code></a> in <a href="https://redirect.github.com/DeterminateSystems/magic-nix-cache-action/pull/99">DeterminateSystems/magic-nix-cache-action#99</a></li> <li>Fixup diagnostic URL handling by <a href="https://github.com/grahamc"><code>@​grahamc</code></a> in <a href="https://redirect.github.com/DeterminateSystems/magic-nix-cache-action/pull/100">DeterminateSystems/magic-nix-cache-action#100</a></li> <li>Diagnostics by <a href="https://github.com/grahamc"><code>@​grahamc</code></a> in <a href="https://redirect.github.com/DeterminateSystems/magic-nix-cache-action/pull/101">DeterminateSystems/magic-nix-cache-action#101</a></li> <li>Warn on mnc usage by <a href="https://github.com/grahamc"><code>@​grahamc</code></a> in <a href="https://redirect.github.com/DeterminateSystems/magic-nix-cache-action/pull/102">DeterminateSystems/magic-nix-cache-action#102</a></li> </ul> <p><strong>Full Changelog</strong>: <a href="https://github.com/DeterminateSystems/magic-nix-cache-action/compare/v8...v9">https://github.com/DeterminateSystems/magic-nix-cache-action/compare/v8...v9</a></p> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/DeterminateSystems/magic-nix-cache-action/commit/6221693898146dc97e38ad0e013488a16477a4c4"><code>6221693</code></a> Warn on mnc usage (<a href="https://redirect.github.com/determinatesystems/magic-nix-cache-action/issues/102">#102</a>)</li> <li><a href="https://github.com/DeterminateSystems/magic-nix-cache-action/commit/f7eb5b510a46ce3f40945f76d6176296370bdb51"><code>f7eb5b5</code></a> Diagnostics (<a href="https://redirect.github.com/determinatesystems/magic-nix-cache-action/issues/101">#101</a>)</li> <li><a href="https://github.com/DeterminateSystems/magic-nix-cache-action/commit/fe89a484fefe341a62c3488265cfc9aabfcb3a36"><code>fe89a48</code></a> Fixup diagnostic URL handling (<a href="https://redirect.github.com/determinatesystems/magic-nix-cache-action/issues/100">#100</a>)</li> <li><a href="https://github.com/DeterminateSystems/magic-nix-cache-action/commit/13dabe8ccc07ba82ad7ccfa52035616223194012"><code>13dabe8</code></a> Update <code>detsys-ts</code> for: `Merge pull request <a href="https://redirect.github.com/determinatesystems/magic-nix-cache-action/issues/69">#69</a> from DeterminateSystems/updat...</li> <li><a href="https://github.com/DeterminateSystems/magic-nix-cache-action/commit/9ab3ce70d6d64cd6e4f4506ccb757152453ccaa6"><code>9ab3ce7</code></a> Matrix (<a href="https://redirect.github.com/determinatesystems/magic-nix-cache-action/issues/96">#96</a>)</li> <li><a href="https://github.com/DeterminateSystems/magic-nix-cache-action/commit/a76a83091cd8728db8c37312dbdd0eeb1177a6c0"><code>a76a830</code></a> ci workflow: don't check initial substituter list (<a href="https://redirect.github.com/determinatesystems/magic-nix-cache-action/issues/90">#90</a>)</li> <li>See full diff in <a href="https://github.com/determinatesystems/magic-nix-cache-action/compare/v8...v9">compare view</a></li> </ul> </details> <br /> [](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. 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