Revert "Use nextest as test runner"

The nextest runner does not help enough to be viable. Installing it
takes more time than the runner saves, so go back to the normal test
runner with this patch.

This reverts commit 284de85.
Signed-off-by: Matthias Beyer <[email protected]>

.github/workflows/msrv.yml

@@ -39,9 +39,6 @@ jobs:
       - name: Checkout sources
         uses: actions/[email protected]
 
-      - name: Install nextest
-        uses: taiki-e/install-action@nextest
-
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@master
         with:
@@ -50,9 +47,9 @@ jobs:
       - name: Cache
         uses: Swatinem/rust-cache@v2
 
-      - name: Run cargo nextest
+      - name: Run cargo test
         continue-on-error: ${{ matrix.rust == 'beta' }}
-        run: cargo nextest run --all-features
+        run: cargo test --all-features
 
   fmt:
     needs: [check]