chore(deps): bump viem from 1.16.2 to 1.21.3

Bumps [viem](https://github.com/wevm/viem) from 1.16.2 to 1.21.3.
- [Release notes](https://github.com/wevm/viem/releases)
- [Commits](https://github.com/wevm/viem/compare/viem@1.16.2...viem@1.21.3)

---
updated-dependencies:
- dependency-name: viem
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

examples/demo/package.json

@@ -57,7 +57,7 @@
     "iso-filecoin": "^3.0.1",
     "preact": "^10.17.1",
     "react-hook-form": "^7.46.2",
-    "viem": "^1.16.2",
+    "viem": "^1.21.3",
     "wagmi": "^1.4.2",
     "water.css": "^2.1.1"
   },

examples/fil-forwarder-viem/package.json

@@ -50,7 +50,7 @@
     "iso-base": "^2.0.1",
     "iso-filecoin": "^3.0.1",
     "prettier": "3.0.3",
-    "viem": "^1.16.2"
+    "viem": "^1.21.3"
   },
   "devDependencies": {
     "@babel/core": "^7.22.20",

packages/snap/package.json

@@ -81,7 +81,7 @@
     "iso-base": "^2.0.1",
     "iso-filecoin": "^3.0.1",
     "merge-options": "^3.0.4",
-    "viem": "^1.16.2",
+    "viem": "^1.21.3",
     "zod": "^3.22.4"
   },
   "devDependencies": {