Update .gitattributes

Author: tvdijen

.gitattributes

@@ -3,14 +3,19 @@
 /tools/ export-ignore
 /tests/bootstrap.php export-ignore
 /tests/resources/xml export-ignore
+/tests/Helper/ export-ignore
 /tests/InterOperability/ export-ignore
+/tests/Registry/ export-ignore
 /tests/Utils/ export-ignore
 /tests/XML/ export-ignore
+/tests/XPath/ export-ignore
 /tests/XMLSchema/ export-ignore
 codecov.yml export-ignore
 .editorconfig export-ignore
 .gitattributes export-ignore
 .gitignore export-ignore
+phpstan-baseline.neon export-ignore
+phpstan-baseline-dev.neon export-ignore
 phpstan.neon export-ignore
 phpstan-dev.neon export-ignore
 phpcs.xml export-ignore