Update primer/octicons to 19.19.0 from 19.15.5 to add MCP icon and other new icons (#58084)

Co-authored-by: mc <42146119+mchammer01@users.noreply.github.com>

Author: felicitymay

package-lock.json

@@ -159,7 +159,7 @@
     "@primer/behaviors": "^1.7.2",
     "@primer/css": "^21.3.1",
     "@primer/live-region-element": "^0.7.2",
-    "@primer/octicons": "^19.15.5",
+    "@primer/octicons": "^19.19.0",
     "@primer/octicons-react": "^19.14.0",
     "@primer/react": "^37.31.0",
     "accept-language-parser": "^1.5.0",