Limit tests to one thread

Author: AfoHT

.github/workflows/build.yml

@@ -205,7 +205,7 @@ jobs:
         with:
           use-cross: false
           command: test
-          args: --test tsan --target=${{ matrix.target }} --features=${{ matrix.features }} ${{ matrix.buildtype }}
+          args: --test tsan --target=${{ matrix.target }} --features=${{ matrix.features }} ${{ matrix.buildtype }} -- --test-threads=1
 
   # Run cfail tests on MSRV
   testcfail: