Bump shivammathur/setup-php from 2.1.0 to 2.37.1 in /.github/workflows

Bumps [shivammathur/setup-php](https://github.com/shivammathur/setup-php) from 2.1.0 to 2.37.1.
- [Release notes](https://github.com/shivammathur/setup-php/releases)
- [Commits](shivammathur/setup-php@2.1.0...2.37.1)

---
updated-dependencies:
- dependency-name: shivammathur/setup-php
  dependency-version: 2.37.1
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: Set up PHP
-        uses: shivammathur/setup-php@2.9.0
+        uses: shivammathur/setup-php@2.37.1
         with:
           php-version: ${{ matrix.php }}
           coverage: none
@@ -33,7 +33,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Set up PHP
-        uses: shivammathur/setup-php@2.1.0
+        uses: shivammathur/setup-php@2.37.1
         with:
           php-version: 7.4
           coverage: none