Update github-actions to v26

.github/turbo-build/Dockerfile

@@ -11,7 +11,7 @@
 # The ubuntu:22.04 base pins the built binaries' glibc symbol floor at
 # 2.34 (RHEL 9, Ubuntu 22.04+, Debian 12+) independently of the runner
 # image — same floor as the previous `container: ubuntu:22.04` legs.
-FROM ubuntu:22.04
+FROM ubuntu:26.04
 
 ARG PHP_MINOR
 # 1 builds a thread-safe PHP (the -zts tags)

.github/workflows/phar.yml

@@ -989,7 +989,7 @@
     # ships an x64 musl Node). Instead the workflow steps run on the arm64
     # host and only the build commands run inside a long-lived Alpine
     # container via docker exec — native arm64, no QEMU.
-    runs-on: "ubuntu-24.04-arm"
+    runs-on: "ubuntu-26.04-arm"
     needs: turbo-compile-core-musl-arm64
     if: ${{ !cancelled() }}
     timeout-minutes: ${{ matrix.variant == 'pie' && 45 || 20 }}