ci: github: codecov might expect arm on mac by now

Author: m6w6

.github/workflows/cmake-build-ci.gen

@@ -8,7 +8,7 @@ const DEF = [
 
   "Linux"   => "ubuntu-24.04", "ubuntu-24.04" => "gnu",
   "Windows" => "windows-2022", "windows-2022" => "msvc",
-  "macOS"   => "macos-13",     "macos-13"     => "clang",
+  "macOS"   => "macos-15",     "macos-15"     => "clang",
 
   "gnu" => [
     "CC"  => "gcc",

.github/workflows/cmake-build-ci.yml

@@ -293,16 +293,16 @@ jobs:
 
   # coverage mac
   debug-coverage-mac:
-    name: debug coverage (macos-13, clang)
-    runs-on: macos-13 #
+    name: debug coverage (macos-15, clang)
+    runs-on: macos-15 #
     env:
       CMAKE_BUILD_TYPE:   "Debug"
       BUILD_TESTING:      "ON"
       VERBOSE:            "ON"
       CFLAGS:             "-O0 --coverage"
       CXXFLAGS:           "-O0 --coverage"
       OS_VND:   macOS #
-      OS_VER:   macos-13 #
+      OS_VER:   macos-15 #
       CC_VND:   clang #
       CC_VER:   cur
     continue-on-error: true
@@ -374,7 +374,7 @@ jobs:
       CMAKE_BUILD_TYPE:   "Release"
       BUILD_DOCS_MANGZ:   "ON"
       OS_VND:   macOS #
-      OS_VER:   macos-13 #
+      OS_VER:   macos-15 #
       CC_VND:   clang #
       CC_VER:   cur
     continue-on-error: true