ci: Update taplo CI

Switch from Action for taplo CI to manual install and running. Use only
`taplo format` and remove `taplo lint` check.

.github/workflows/taplo.yaml

@@ -1,4 +1,4 @@
-name: Taplo formatting and linting
+name: Taplo formatting
 
 on:
   push:
@@ -7,21 +7,17 @@ on:
     paths: "**/Cargo.toml"
 
 jobs:
-  lint:
-    name: Lint Cargo.toml
+  toml:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-
-      - uses: uncenter/[email protected]
-
-      - run: taplo lint --verbose
-  fmt:
-    name: Format Cargo.toml
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: uncenter/[email protected]
-
-      - run: taplo format --check --verbose
+      - uses: dtolnay/rust-toolchain@stable
+      - name: Install taplo
+        run: cargo install taplo-cli --lock
+      - name: Run taplo
+        run: taplo format --check --diff
+      - name: Taplo failure info
+        if: failure()
+        run: |
+          echo 'TOML is not formatted correctly'
+          echo 'Please run `taplo format`'