Bump shivammathur/setup-php from 2 to 2.11.0

Bumps [shivammathur/setup-php](https://github.com/shivammathur/setup-php) from 2 to 2.11.0.
- [Release notes](https://github.com/shivammathur/setup-php/releases)
- [Commits](shivammathur/setup-php@v2...2.11.0)

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

Author: dependabot[bot]

.github/workflows/tests.yml

@@ -49,7 +49,7 @@ jobs:
                 run: docker exec crowdsec cscli machines add PhpUnitTestMachine --password PhpUnitTestMachinePassword
 
             -   name: Setup PHP
-                uses: shivammathur/setup-php@v2
+                uses: shivammathur/setup-php@2.11.0
                 with:
                     coverage: "none"
                     extensions: "json,memcached,redis,xsl,ldap,gd"