Update WorkOS logo background

public/sponsors/workos-logo.svg

@@ -1,5 +1,5 @@
 <svg width="1354" height="420" viewBox="0 0 1354 420" fill="none" xmlns="http://www.w3.org/2000/svg">
-<rect width="1354" height="420" rx="20" fill="white"/>
+<rect width="1354" height="420" rx="20" fill="none"/>
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