fix: remove false positives about linting

Previously `grep` mangled exit code for job because when grep doesn't
find any matching lines, it returns 1, which invalidates our
pipeline. On the other hand, any found errors are treated as expected
result because lines matched and grep returned valid exit code `0`.

Mitigate this behavior by manually overriding exit code with simple
boolean gate.

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

includes/tests/lint.yml

@@ -2,11 +2,11 @@
   stage: tests
   script:
     - composer install --no-dev
-    - find -name '*.php' -print0 |xargs -n1 -0 -P16 php -l |grep -v "No syntax errors detected"
+    - find -name '*.php' -print0 |xargs -n1 -0 -P16 php -l |grep -v "No syntax errors detected" || exit 0
 
-lint:8.1:
+lint:8.2:
   <<: *lint-tmpl
-  image: gitlab.wpdesk.dev:5050/wpdesk/docker-tests/php-box:8.1
+  image: gitlab.wpdesk.dev:5050/wpdesk/docker-tests/php-box:8.2
 
 lint:7.2:
   <<: *lint-tmpl