Add nextest to our latest dependencies CI check (#1526)

Also, remove the `if: always()` on the conclusion step of CI so that it doesn't pop up when we just change the `latest-deps.yaml`.

Author: akern40

.github/workflows/ci.yaml

@@ -200,7 +200,6 @@ jobs:
       - cross_test
       - cargo-careful
       - docs
-    if: always()
     runs-on: ubuntu-latest
     steps:
       - name: Result

.github/workflows/latest-deps.yaml

@@ -35,6 +35,8 @@ jobs:
         uses: rui314/setup-mold@v1
       - name: Setup Rust Cache
         uses: Swatinem/rust-cache@v2
+      - name: Install nextest
+        uses: taiki-e/install-action@nextest
       - name: Install openblas
         run: sudo apt-get install libopenblas-dev gfortran
       - name: Ensure latest dependencies
@@ -56,6 +58,8 @@ jobs:
         uses: rui314/setup-mold@v1
       - name: Setup Rust Cache
         uses: Swatinem/rust-cache@v2
+      - name: Install nextest
+        uses: taiki-e/install-action@nextest
       - name: Install openblas
         run: sudo apt-get install libopenblas-dev gfortran
       - name: Ensure latest dependencies