[ci] Replace unmaintained actions-rs GH actions

[olivierlemasle]

The whole GH actions-rs is archived, and its GitHub actions are all unmaintained. They also use deprecated GitHub Actions features (node12 and set-output).

However, they are still heavily used in Tauri CI:

$ grep -r "actions-rs" .github/workflows
.github/workflows/covector-version-or-publish-v1.yml:        uses: actions-rs/toolchain@v1
.github/workflows/covector-version-or-publish-v1.yml:        uses: actions-rs/cargo@v1
.github/workflows/udeps.yml:      - uses: actions-rs/toolchain@v1
.github/workflows/udeps.yml:      - uses: actions-rs/cargo@v1
.github/workflows/udeps.yml:      - uses: actions-rs/toolchain@v1
.github/workflows/udeps.yml:      - uses: actions-rs/cargo@v1
.github/workflows/audit.yml:        uses: actions-rs/audit-check@v1
.github/workflows/docker.yml:        uses: actions-rs/toolchain@v1
.github/workflows/docker.yml:        uses: actions-rs/cargo@v1
.github/workflows/docker.yml:        uses: actions-rs/toolchain@v1
.github/workflows/check-generated-files.yml:        uses: actions-rs/toolchain@v1
.github/workflows/check-generated-files.yml:        uses: actions-rs/cargo@v1
.github/workflows/lint-core.yml:      - uses: actions-rs/toolchain@v1
.github/workflows/lint-core.yml:      - uses: actions-rs/cargo@v1
.github/workflows/lint-core.yml:      - uses: actions-rs/toolchain@v1
.github/workflows/lint-core.yml:      - uses: actions-rs/clippy-check@v1
.github/workflows/publish-cli-js.yml:        uses: actions-rs/toolchain@v1
.github/workflows/publish-cli-rs.yml:        uses: actions-rs/cargo@v1
.github/workflows/lint-cli.yml:      - uses: actions-rs/toolchain@v1
.github/workflows/lint-cli.yml:      - uses: actions-rs/cargo@v1
.github/workflows/lint-cli.yml:      - uses: actions-rs/toolchain@v1
.github/workflows/lint-cli.yml:      - uses: actions-rs/clippy-check@v1
.github/workflows/test-cli-rs.yml:        uses: actions-rs/cargo@v1
.github/workflows/test-cli-js.yml:        uses: actions-rs/toolchain@v1
.github/workflows/test-core.yml:        uses: actions-rs/toolchain@v1
.github/workflows/bench.yml:        uses: actions-rs/toolchain@v1
.github/workflows/test-android.yml:        uses: actions-rs/toolchain@v1
.github/workflows/test-android.yml:        uses: actions-rs/cargo@v1
.github/workflows/covector-version-or-publish.yml:        uses: actions-rs/toolchain@v1
.github/workflows/covector-version-or-publish.yml:        uses: actions-rs/cargo@v1
.github/workflows/test-lint-bundler.yml:        uses: actions-rs/toolchain@v1
.github/workflows/test-lint-bundler.yml:      - uses: actions-rs/toolchain@v1
.github/workflows/test-lint-bundler.yml:      - uses: actions-rs/cargo@v1
.github/workflows/test-lint-bundler.yml:        uses: actions-rs/toolchain@v1
.github/workflows/test-lint-bundler.yml:        uses: actions-rs/clippy-check@v1

tauri-apps/plugins-workspace has already migrated: cf tauri-apps/plugins-workspace#45 and tauri-apps/plugins-workspace#294

• actions-rs/toolchain should be replaced by dtolnay/rust-toolchain
• actions-rs/cargo and actions-rs/clippy-check can be replaced by simple cargo commands
• actions-rs/audit-check should be replaced by its rustsec fork

Please assign this to me.