Update social links for Grant Fritchey

Author: Andreas Scherbaum

postgresfriends.json

@@ -809,7 +809,8 @@
 		"Blog": ["https://scarydba.com"],
 		"Twitter": ["https://twitter.com/GFritchey"],
 		"Facebook": ["https://www.facebook.com/GFritchey"],
-		"LinkedIn": ["https://www.linkedin.com/in/grant-fritchey/"]
+		"LinkedIn": ["https://www.linkedin.com/in/grant-fritchey/"],
+		"Mastodon": ["https://mastodon.social/@gfritchey"]
 	},
 	"Jonah H. Harris": {
 		"interview": "jonah_h._harris",