Upgrade cargo-deny action, remove deprecated deny configurations (#1168)

The `cargo-deny` action we depend on release v2 in August, and with it
made breaking changes. Dependabot was unable to merge due to these
breaking changes: #969

This change removes the deprecated configurations. `cargo-deny` now
marks all of those we configured as denied rather than allowing the
violations to be downgraded to warnings or allowed. This impacts us only
for 'unmaintained' crates which is fine, if needed we can always create
an exception entry.

### Does this change impact existing behavior?

This is a CI change only. We upgrade, removing unused and deprecated
fields. Unmaintained crates will now fail CI.

### Does this change need a changelog entry?

No, there is no customer-facing change.

---

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license and I agree to the terms of
the [Developer Certificate of Origin
(DCO)](https://developercertificate.org/).

Signed-off-by: Daniel Carl Jones <[email protected]>

.github/workflows/tests.yml

@@ -70,7 +70,7 @@ jobs:
       # Once the runners' image is updated (tracking https://github.com/actions/runner-images/pull/11011),
       # we could revert to just:
       #   brew update > /dev/null && brew install pkgconfig
-      run: |           
+      run: |
           brew update
           brew uninstall --ignore-dependencies --force [email protected]
           brew install pkgconf
@@ -280,11 +280,5 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
-      - name: Set up Rust toolchain
-        uses: actions-rust-lang/setup-rust-toolchain@v1
-        with:
-          # setup-rust-toolchain sets "-D warnings" by default, and Rust treats any warning as compile error.
-          # We need to this currently because `vendor/fuser` contains some warnings and it breaks the build.
-          rustflags: ""
       - name: Run cargo deny
-        uses: EmbarkStudios/cargo-deny-action@v1
+        uses: EmbarkStudios/cargo-deny-action@v2

deny.toml

@@ -19,7 +19,4 @@ license-files = [
 ]
 
 [advisories]
-vulnerability = "deny"
-unmaintained = "warn"
 yanked = "warn"
-notice = "deny"