chore(ramp): upgrade sdk to 1.28.8

package.json

@@ -143,7 +143,7 @@
   },
   "dependencies": {
     "@config-plugins/detox": "^8.0.0",
-    "@consensys/on-ramp-sdk": "1.28.7",
+    "@consensys/on-ramp-sdk": "1.28.8",
     "@keystonehq/bc-ur-registry-eth": "^0.19.1",
     "@keystonehq/metamask-airgapped-keyring": "^0.13.1",
     "@keystonehq/ur-decoder": "^0.12.2",

yarn.lock

@@ -1429,10 +1429,10 @@
   dependencies:
     expo-build-properties "~0.12.1"
 
-"@consensys/[email protected].7":
-  version "1.28.7"
-  resolved "https://registry.yarnpkg.com/@consensys/on-ramp-sdk/-/on-ramp-sdk-1.28.7.tgz#fe26b8935219b2a782c8adc83db7be649cfcd243"
-  integrity sha512-2UE6FBuscFrsA/nUi1ZYu+sK0IXM1BbxN1876uHb9+LUGrtrBrnyMa9hrMJYRc9so7i+8Gy4bty70kCOIqzeGw==
+"@consensys/[email protected].8":
+  version "1.28.8"
+  resolved "https://registry.yarnpkg.com/@consensys/on-ramp-sdk/-/on-ramp-sdk-1.28.8.tgz#e39d833974d9d49653a2ec107ffbebadb49580d1"
+  integrity sha512-snm1hGjIaFMHvB7seLoaBgUQXH1n8/iXPMSm96d5QItFKVw4GZyqsKRnuT2u/CwIeXtYOKf59q7+Lp0UMg+mFQ==
   dependencies:
     async "^3.2.3"
     axios "^0.28.0"