Update dependency wpackagist-plugin/wordpress-importer to v0.8.4

This MR contains the following updates:

Package	Type	Update	Change
wpackagist-plugin/wordpress-importer (source)	require	patch	0.8.3 -> 0.8.4

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composer.json

@@ -93,7 +93,7 @@
         "wpackagist-plugin/squat-radar-calendar-integration": "2.0.9",
         "wpackagist-plugin/two-factor": "0.13.0",
         "wpackagist-plugin/video-sidebar-widgets": "6.1",
-        "wpackagist-plugin/wordpress-importer": "0.8.3",
+        "wpackagist-plugin/wordpress-importer": "0.8.4",
         "wpackagist-plugin/katex": "2.2.3",
         "noblogs/eu-compliance": "0.1.0",
         "noblogs/nospam": "0.2.4",