ci(workflows): Upgrade macOS runner to macos-26

Author: arturcic

.github/workflows/_build.yml

@@ -4,14 +4,14 @@ on:
 env:
   DOTNET_INSTALL_DIR: "./.dotnet"
   DOTNET_ROLL_FORWARD: "Major"
-  
+
 jobs:
   build:
     name: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
-        os: [windows-2025, ubuntu-24.04, macos-15]
+        os: [windows-2025, ubuntu-24.04, macos-26]
 
     runs-on: ${{ matrix.os }}
     steps:

.github/workflows/_prepare.yml

@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [windows-2025, ubuntu-24.04, macos-15]
+        os: [windows-2025, ubuntu-24.04, macos-26]
 
     runs-on: ${{ matrix.os }}
     steps:
@@ -69,4 +69,4 @@ jobs:
         name: '[Matrix]'
         id: set_matrix
         shell: pwsh
-        run: dotnet run/config.dll --target=SetMatrix
+        run: dotnet run/config.dll --target=SetMatrix

.github/workflows/_unit_tests.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ windows-2025, ubuntu-24.04, macos-15 ]
+        os: [ windows-2025, ubuntu-24.04, macos-26 ]
         dotnet_version: ${{ fromJson(inputs.dotnet_versions) }}
 
     runs-on: ${{ matrix.os }}