Bump shivammathur/setup-php from 2.4.1 to 2.4.3

Bumps [shivammathur/setup-php](https://github.com/shivammathur/setup-php) from 2.4.1 to 2.4.3.
- [Release notes](https://github.com/shivammathur/setup-php/releases)
- [Commits](shivammathur/setup-php@2.4.1...9e6b9d7)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/main.yml

@@ -17,13 +17,13 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      - uses: shivammathur/[email protected].1
+      - uses: shivammathur/[email protected].3
         with:
           php-version: ${{ matrix.php-versions }}
           coverage: none
         if: matrix.php-versions != '7.4' || matrix.dependencies != 'highest'
 
-      - uses: shivammathur/[email protected].1
+      - uses: shivammathur/[email protected].3
         with:
           php-version: ${{ matrix.php-versions }}
           coverage: pcov
@@ -57,7 +57,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
-      - uses: shivammathur/[email protected].1
+      - uses: shivammathur/[email protected].3
         with:
           php-version: 7.4
           coverage: none
@@ -74,7 +74,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
-      - uses: shivammathur/[email protected].1
+      - uses: shivammathur/[email protected].3
         with:
           php-version: 7.4
           coverage: none