Align .gitattributes export-ignore with filesystem state

Author: WyriHaximus

.gitattributes

@@ -1,16 +1,13 @@
 # Ignoring files for distribution archieves
-.dependabot/ export-ignore
+.github/ export-ignore
+etc/ export-ignore
 tests/ export-ignore
+var/ export-ignore
+.devcontainer.json export-ignore
 .editorconfig export-ignore
 .gitattributes export-ignore
 .gitignore export-ignore
-.scrutinizer.yml export-ignore
-composer-require-checker.json export-ignore
 CONTRIBUTING.md export-ignore
 infection.json.dist export-ignore
 Makefile export-ignore
-phpcs.xml.dist export-ignore
-phpstan.neon export-ignore
-phpunit.xml.dist export-ignore
-psalm.xml export-ignore
 README.md export-ignore