fix: replace extends with yaml anchor

Signed-off-by: Bart Jaskulski <bjaskulski@protonmail.com>

includes/tests/static-analysis.yml

-.static-analysis:
+.static-analysis: &static-tmpl
   image: gitlab.wpdesk.dev:5050/wpdesk/docker-tests/php-box:8.2
   needs:
     - prepare prefixed vendor
@@ -6,7 +6,7 @@
 
 # Run phpstan in strict mode (failing pipeline) only if we have baseline, otherwise allow to fail with a warning, suggesting to create one. This behavior will change at the end of the year, when any PHPStan failure will be considered fatal
 phpstan:
-  extends: .static-analysis
+  <<: *static-tmpl
   script:
     - |
       if [ -f "vendor/bin/phpstan" ]; then
@@ -27,7 +27,7 @@ phpstan:
       allow_failure: false
 
 phpcs:
-  extends: .static-analysis
+  <<: *static-tmpl
   script:
     - vendor/bin/phpcs
   allow_failure: true