chore: update GitHub Actions macOS runner from 13 to 15 (webdriverio#14925)

Author: mccmrunal

.github/workflows/test-launch.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ['ubuntu-latest', 'windows-latest', 'macos-13']
+        os: ['ubuntu-latest', 'windows-latest', 'macos-15']
     runs-on: ${{ matrix.os }}
     steps:
       - name: ⬇️ Checkout Code

.github/workflows/test-multiremote.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ['windows-latest', 'macos-13']
+        os: ['windows-latest', 'macos-15']
     runs-on: ${{ matrix.os }}
     steps:
       - name: ⬇️ Checkout Code

.github/workflows/test-standalone.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ['windows-latest', 'macos-13']
+        os: ['windows-latest', 'macos-15']
     runs-on: ${{ matrix.os }}
     steps:
       - name: ⬇️ Checkout Code

.github/workflows/test-testrunner.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ['windows-latest', 'macos-13']
+        os: ['windows-latest', 'macos-15']
     runs-on: ${{ matrix.os }}
     steps:
       - name: ⬇️ Checkout Code