chore(codecov): remove concurrency

.github/workflows/unit.yaml

@@ -8,19 +8,12 @@ env:
   CARGO_TERM_COLOR: always
   SEED: rustethereumethereumrust
 
-concurrency:
-  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
-  cancel-in-progress: true
-
 name: unit
 jobs:
   test:
-    name: test (partition ${{ matrix.partition }}/${{ strategy.job-total }})
+    name: unit-tests
     runs-on:
       group: ubuntu-latest
-    strategy:
-      matrix:
-        partition: [1, 2]
     timeout-minutes: 60
     steps:
       - name: Checkout sources
@@ -51,7 +44,6 @@ jobs:
         run: |
           cargo llvm-cov nextest --lcov --output-path lcov.info \
             --locked --all-features --workspace --exclude examples --exclude ef-tests  \
-            --partition hash:${{ matrix.partition }}/${{ strategy.job-total }} \
             -E 'kind(lib)' -E 'kind(bin)' -E 'kind(proc-macro)'
 
       - name: Upload coverage data to codecov