feat(design-tokens): NO-JIRA updated dark muted foreground color

Author: francisrupert

packages/dialtone-tokens/tokens/semantic/dp/dark.json

@@ -8,7 +8,7 @@
           "studio.tokens": {
             "modify": {
               "type": "alpha",
-              "value": ".6",
+              "value": ".65",
               "space": "hsl"
             }
           }