build: make the coverage workflow more similar to the testsuite workflow

Author: nedbat

.github/workflows/coverage.yml

@@ -29,15 +29,15 @@ concurrency:
 
 jobs:
   coverage:
-    name: "Python ${{ matrix.python-version }} on ${{ matrix.os }}"
-    runs-on: "${{ matrix.os }}"
+    name: "${{ matrix.python-version }} on ${{ matrix.os }}"
+    runs-on: "${{ matrix.os }}-latest"
 
     strategy:
       matrix:
         os:
-          - ubuntu-latest
-          - macos-latest
-          - windows-latest
+          - ubuntu
+          - macos
+          - windows
         python-version:
           # When changing this list, be sure to check the [gh] list in
           # tox.ini so that tox will run properly. PYVERSIONS

.github/workflows/python-nightly.yml

@@ -31,7 +31,7 @@ concurrency:
 
 jobs:
   tests:
-    name: "Python ${{ matrix.python-version }}"
+    name: "${{ matrix.python-version }}"
     # Choose a recent Ubuntu that deadsnakes still builds all the versions for.
     # For example, deadsnakes doesn't provide 3.10 nightly for 22.04 (jammy)
     # because jammy ships 3.10, and deadsnakes doesn't want to clobber it.