chore(ci): remove unused similarity and nixfmt from lint job

These tools are not used by pnpm lint (only oxfmt, oxlint, knip).

Author: ryoppippi

.github/workflows/ci.yaml

@@ -41,7 +41,7 @@ jobs:
       - name: Setup Nix
         uses: ./.github/actions/setup-nix
         with:
-          tools: nodejs_24 pnpm_10 oxlint oxfmt similarity nixfmt
+          tools: nodejs_24 pnpm_10 oxlint oxfmt
       - name: Run Lint
         run: pnpm run lint