fix: update deprecated GitHub Actions runners

Replace removed runners:
- windows-2019 → windows-2022 (with VS generator 16 2019 → 17 2022)
- macos-13 → macos-15 (Intel macOS runners retired; macos-15 is ARM64)

https://claude.ai/code/session_017C9kqtVWUdnfMqosKJchiG

Author: claude

.github/workflows/ci.yml

@@ -45,7 +45,7 @@ jobs:
       fail-fast: false
       matrix:
         target:
-          - runner: macos-13
+          - runner: macos-15
             cmake: -DLLAMA_METAL=OFF -DLLAMA_VERBOSE=ON
           - runner: macos-14
             cmake: -DLLAMA_METAL_EMBED_LIBRARY=ON -DLLAMA_VERBOSE=ON
@@ -75,8 +75,8 @@ jobs:
           if-no-files-found: warn
 
   build-and-test-windows:
-    name: windows-2019
-    runs-on: windows-2019
+    name: windows-2022
+    runs-on: windows-2022
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-java@v4

.github/workflows/release.yaml

@@ -74,7 +74,7 @@ jobs:
       matrix:
         target:
           - {
-            runner: macos-13,
+            runner: macos-15,
             cmake: '-DLLAMA_METAL=OFF'
           }
           - {
@@ -97,20 +97,20 @@ jobs:
 
   build-win-native:
     name: Build ${{ matrix.target.os }}-${{ matrix.target.arch }}
-    runs-on: windows-2019
+    runs-on: windows-2022
     strategy:
       fail-fast: false
       matrix:
         target:
           - {
             os: Windows,
             arch: x86_64,
-            cmake: '-G "Visual Studio 16 2019" -A "x64"'
+            cmake: '-G "Visual Studio 17 2022" -A "x64"'
           }
           - {
             os: Windows,
             arch: x86,
-            cmake: '-G "Visual Studio 16 2019" -A "Win32"'
+            cmake: '-G "Visual Studio 17 2022" -A "Win32"'
           }
 # MSVC aarch64 builds no longer work with llama.cpp (requires clang instead)
 #          - {