minor #4745 Update .gitattributes to remove splitsh.json (williamdes)

This PR was merged into the 3.x branch.

Discussion
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Update .gitattributes to remove splitsh.json

- Updated .gitattributes to remove splitsh.json

Commits
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79aecfb Update .gitattributes to remove splitsh.json

Author: fabpot

.gitattributes

@@ -8,3 +8,4 @@
 /phpunit.xml.dist export-ignore
 /phpstan.neon.dist export-ignore
 /phpstan-baseline.neon export-ignore
+/splitsh.json export-ignore