ci: build multiple Python versions in parallel

Our build system supports this now. So update CI to make use of
the feature.

On Linux, 3.13 freethreaded builds are still their own CI job. We
may need to tweak `build-main.py` to allow intelligently selecting
freethreaded compatible versions. We could potentially also allow
building freethreaded in parallel with non-freethreaded. This can be
done as a followup.

.github/workflows/apple.yml

@@ -2,7 +2,7 @@ name: MacOS Python build
 
 on:
   push:
-    branches: [main]
+    branches: [ main ]
   pull_request:
 
 concurrency:
@@ -44,7 +44,7 @@ jobs:
         build:
           - target_triple: 'aarch64-apple-darwin'
             runner: macos-14
-            py: 'cpython-3.9'
+            py: 'all'
             options: 'debug'
           - target_triple: 'aarch64-apple-darwin'
             runner: macos-14
@@ -55,10 +55,6 @@ jobs:
             py: 'cpython-3.9'
             options: 'pgo+lto'
 
-          - target_triple: 'aarch64-apple-darwin'
-            runner: macos-14
-            py: 'cpython-3.10'
-            options: 'debug'
           - target_triple: 'aarch64-apple-darwin'
             runner: macos-14
             py: 'cpython-3.10'
@@ -68,10 +64,6 @@ jobs:
             py: 'cpython-3.10'
             options: 'pgo+lto'
 
-          - target_triple: 'aarch64-apple-darwin'
-            runner: macos-14
-            py: 'cpython-3.11'
-            options: 'debug'
           - target_triple: 'aarch64-apple-darwin'
             runner: macos-14
             py: 'cpython-3.11'
@@ -81,10 +73,6 @@ jobs:
             py: 'cpython-3.11'
             options: 'pgo+lto'
 
-          - target_triple: 'aarch64-apple-darwin'
-            runner: macos-14
-            py: 'cpython-3.12'
-            options: 'debug'
           - target_triple: 'aarch64-apple-darwin'
             runner: macos-14
             py: 'cpython-3.12'
@@ -94,10 +82,6 @@ jobs:
             py: 'cpython-3.12'
             options: 'pgo+lto'
 
-          - target_triple: 'aarch64-apple-darwin'
-            runner: macos-14
-            py: 'cpython-3.13'
-            options: 'debug'
           - target_triple: 'aarch64-apple-darwin'
             runner: macos-14
             py: 'cpython-3.13'
@@ -125,7 +109,7 @@ jobs:
           # or LTO builds.
           - target_triple: 'x86_64-apple-darwin'
             runner: macos-13
-            py: 'cpython-3.9'
+            py: 'all'
             options: 'debug'
           - target_triple: 'x86_64-apple-darwin'
             runner: macos-13
@@ -136,10 +120,6 @@ jobs:
             py: 'cpython-3.9'
             options: 'pgo+lto'
 
-          - target_triple: 'x86_64-apple-darwin'
-            runner: macos-13
-            py: 'cpython-3.10'
-            options: 'debug'
           - target_triple: 'x86_64-apple-darwin'
             runner: macos-13
             py: 'cpython-3.10'
@@ -149,10 +129,6 @@ jobs:
             py: 'cpython-3.10'
             options: 'pgo+lto'
 
-          - target_triple: 'x86_64-apple-darwin'
-            runner: macos-13
-            py: 'cpython-3.11'
-            options: 'debug'
           - target_triple: 'x86_64-apple-darwin'
             runner: macos-13
             py: 'cpython-3.11'
@@ -162,10 +138,6 @@ jobs:
             py: 'cpython-3.11'
             options: 'pgo+lto'
 
-          - target_triple: 'x86_64-apple-darwin'
-            runner: macos-13
-            py: 'cpython-3.12'
-            options: 'debug'
           - target_triple: 'x86_64-apple-darwin'
             runner: macos-13
             py: 'cpython-3.12'
@@ -175,10 +147,6 @@ jobs:
             py: 'cpython-3.12'
             options: 'pgo+lto'
 
-          - target_triple: 'x86_64-apple-darwin'
-            runner: macos-13
-            py: 'cpython-3.13'
-            options: 'debug'
           - target_triple: 'x86_64-apple-darwin'
             runner: macos-13
             py: 'cpython-3.13'