gh-145098: Run Apple Silicon macOS CI on macos-26 (Tahoe)

Author: clintonsteiner

.github/workflows/build.yml

@@ -200,10 +200,10 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # macos-14 is M1, macos-15-intel is Intel.
+        # macos-26 is Apple Silicon, macos-15-intel is Intel.
         # macos-15-intel only runs tests against the GIL-enabled CPython.
         os:
-        - macos-14
+        - macos-26
         - macos-15-intel
         free-threading:
         - false
@@ -387,7 +387,7 @@ jobs:
       matrix:
         include:
           - arch: aarch64
-            runs-on: macos-14
+            runs-on: macos-26
           - arch: x86_64
             runs-on: ubuntu-24.04
 
@@ -404,7 +404,7 @@ jobs:
     needs: build-context
     if: needs.build-context.outputs.run-ios == 'true'
     timeout-minutes: 60
-    runs-on: macos-14
+    runs-on: macos-26
     steps:
       - uses: actions/checkout@v6
         with:

.github/workflows/jit.yml

@@ -86,7 +86,7 @@ jobs:
             runner: macos-15-intel
           - target: aarch64-apple-darwin/clang
             architecture: aarch64
-            runner: macos-14
+            runner: macos-26
           - target: x86_64-unknown-linux-gnu/gcc
             architecture: x86_64
             runner: ubuntu-24.04

.github/workflows/tail-call.yml

@@ -69,7 +69,7 @@ jobs:
           - target: x86_64-apple-darwin/clang
             runner: macos-15-intel
           - target: aarch64-apple-darwin/clang
-            runner: macos-14
+            runner: macos-26
     steps:
       - uses: actions/checkout@v6
         with:

Misc/NEWS.d/next/Build/2026-02-22-12-00-00.gh-issue-145098.macos26.rst

@@ -0,0 +1,3 @@
+CI now runs Apple Silicon macOS jobs on GitHub Actions ``macos-26`` (Tahoe)
+instead of ``macos-14`` in the build, JIT, and tail-call workflows.
+Intel-specific jobs remain on ``macos-15-intel``.