Merge pull request numpy#19560 from BvB93/beta

TST: Bump the GitHub actions python 3.10 version

Author: charris

.github/workflows/build_test.yml

@@ -56,7 +56,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8, 3.9, 3.10.0-beta.3]
+        python-version: [3.8, 3.9, 3.10.0-beta.4]
     steps:
     - uses: actions/checkout@v2
       with: