chore[ci]: use --dist worksteal from latest xdist (vyperlang#3869)

should reduce test time, especially when there is a high degree of
parallelism

also increase the number of runners, as gh actions has increased limits
lately

.github/workflows/test.yml

@@ -137,6 +137,7 @@ jobs:
     - name: Run tests
       run: |
         pytest \
+          --dist worksteal \
           -m "not fuzzing" \
           --optimize ${{ matrix.opt-mode }} \
           --evm-version ${{ matrix.evm-version }} \
@@ -171,7 +172,10 @@ jobs:
 
     strategy:
       matrix:
-        group: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60]
+        # note that every time this is updated, `--splits` needs to be
+        # updated below as well.
+        # python -c "print(list(range(1, 121)))"
+        group: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120]
 
     steps:
     - uses: actions/checkout@v4
@@ -195,9 +199,10 @@ jobs:
       run: |
         pytest \
           -m "fuzzing" \
-          --splits 60 \
+          --splits 120 \
           --group ${{ matrix.group }} \
           --splitting-algorithm least_duration \
+          --dist worksteal \
           -r aR tests/
 
     - name: Upload Coverage

quicktest.sh

@@ -6,4 +6,4 @@
 
 # run pytest but bail out on first error and suppress coverage.
 # useful for dev workflow
-pytest -q --no-cov -s --instafail -x --disable-warnings "$@"
+pytest --dist worksteal -q --no-cov -s --instafail -x --disable-warnings "$@"

setup.py

@@ -11,7 +11,7 @@
         "pytest>=8.0,<9.0",
         "pytest-cov>=4.1,<5.0",
         "pytest-instafail>=0.4,<1.0",
-        "pytest-xdist>=2.5,<3.0",
+        "pytest-xdist>=3.5,<4.0",
         "pytest-split>=0.7.0,<1.0",
         "eth-tester[py-evm]>=0.9.0b1,<0.10",
         "eth_abi>=4.0.0,<5.0.0",