ci: use target triple in artifact name

The artifacts are kinda large since we have so many build
configurations. Let's create more of them so each one is smaller.

Author: indygreg

.github/workflows/apple.yml

@@ -213,5 +213,5 @@ jobs:
       - name: Upload Distributions
         uses: actions/upload-artifact@v2
         with:
-          name: dists-macos
+          name: cpython-${{ matrix.triple }}
           path: dist/*

.github/workflows/linux.yml

@@ -191,5 +191,5 @@ jobs:
       - name: Upload Distribution
         uses: actions/upload-artifact@v2
         with:
-          name: dists-linux
+          name: cpython-${{ matrix.triple }}
           path: dist/*

.github/workflows/windows.yml

@@ -90,5 +90,5 @@ jobs:
       - name: Upload Distributions
         uses: actions/upload-artifact@v2
         with:
-          name: dists-windows
+          name: cpython-windows
           path: dist/*