update github workflows

Author: Christopher Doris

.github/workflows/tests.yml

@@ -16,7 +16,7 @@ jobs:
       matrix:
         arch: [x64, x86]
         os: [ubuntu-latest, windows-latest, macos-latest]
-        jlversion: ['1', '1.0']
+        jlversion: ['1']
         pyversion: ['3.x']
         exclude:
         - os: macos-latest
@@ -55,6 +55,7 @@ jobs:
       - uses: julia-actions/julia-runtest@v1
         env:
           JULIA_DEBUG: PythonCall
+          JULIA_PYTHONCALL_EXE: python3
       - uses: julia-actions/julia-processcoverage@v1
       - uses: codecov/codecov-action@v1
         with:
@@ -89,7 +90,6 @@ jobs:
       - uses: julia-actions/julia-runtest@v1
         env:
           JULIA_DEBUG: PythonCall
-          JULIA_PYTHONCALL_EXE: CONDA
       - uses: julia-actions/julia-processcoverage@v1
       - uses: codecov/codecov-action@v1
         with: