Remove old macos runner

Author: lu-zero

.github/workflows/example-project.yml

@@ -13,9 +13,6 @@ jobs:
       matrix:
         include:
           - os: ubuntu-latest
-          # x86_64:
-          - os: macos-13
-          # arm64:
           - os: macos-latest
           - os: windows-latest
             toolchain-suffix: -gnu

.github/workflows/rust.yml

@@ -64,7 +64,7 @@ jobs:
     needs: rustfmt-clippy
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-13, macos-latest]
+        os: [ubuntu-latest, windows-latest, macos-latest]
         toolchain: [nightly, stable]
         include:
           - toolchain: nightly-gnu