Adjust .gitattributes

Signed-off-by: William Desportes <williamdes@wdes.fr>

Author: williamdes

.gitattributes

@@ -1,11 +1,13 @@
 /tools export-ignore
+/tests/benchmarks export-ignore
 .gitattributes export-ignore
 .gitignore export-ignore
 .editorconfig export-ignore
 .github export-ignore
 .weblate export-ignore
 .scrutinizer.yml export-ignore
 infection.json.dist export-ignore
+phpbench.json export-ignore
 phpcs.xml.dist export-ignore
 phpstan.neon.dist export-ignore
 phpstan-baseline.neon export-ignore