Update dependency wpackagist-theme/twentyten to v3.9

This MR contains the following updates:

Package	Type	Update	Change
wpackagist-theme/twentyten (source)	require	minor	3.8 -> 3.9

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composer.json

@@ -73,7 +73,7 @@
         "wpackagist-theme/twentynineteen": "2.5",
         "wpackagist-theme/twentyseventeen": "3.2",
         "wpackagist-theme/twentysixteen": "2.9",
-        "wpackagist-theme/twentyten": "3.8",
+        "wpackagist-theme/twentyten": "3.9",
         "wpackagist-theme/twentythirteen": "3.8",
         "wpackagist-theme/twentytwelve": "3.9",
         "wpackagist-theme/twentytwenty": "2.2",