Migrate to newest macos intel

Migration happens only for v1.x branch to keep support.
Github expects to drop macos intel support fall 2027.

Author: achaikou

.github/workflows/build.yaml

@@ -57,7 +57,7 @@ jobs:
             build_type: "Debug"
             compiler_flags: "-Wextra -Wall -pedantic"
             build_python: "OFF"
-          - os: macos-13
+          - os: macos-15-intel
             privledges: "sudo"
             build_type: "Release"
             build_python: "OFF"

.github/workflows/wheels.yaml

@@ -34,7 +34,7 @@ jobs:
             arch: i686
           # macos-latest runs on arm64 architecture and cibuildwheel cross
           # compiling for x86_64 fails
-          - os: macos-13
+          - os: macos-15-intel
             arch: x86_64
           - os: macos-latest
             arch: arm64