ci: use macos-15 for intel

Signed-off-by: Patrizio Bekerle <[email protected]>

Author: pbek

.github/workflows/build.yml

@@ -15,15 +15,15 @@ jobs:
     strategy:
       matrix:
         qt_version: [5.12.11, 5.15.2, 6.2.0]
-        platform: [ubuntu-latest, windows-latest, macos-latest]
+        platform: [ubuntu-latest, windows-latest, macos-15]
         include:
           - qt_version: 6.2.0
             additional_arguments: -D QT_DEFAULT_MAJOR_VERSION=6
           - platform: ubuntu-latest
             make: make
             CXXFLAGS: -Wall -Wextra -pedantic -Werror
             MAKEFLAGS: -j2
-          - platform: macos-latest
+          - platform: macos-15
             make: make
             CXXFLAGS: -Wall -Wextra -pedantic -Werror -Wno-gnu-zero-variadic-macro-arguments # Ignore false-positive warning for qCWarning
             MAKEFLAGS: -j3