Bump @openzeppelin/contracts from 3.4.2 to 4.9.6

Bumps [@openzeppelin/contracts](https://github.com/OpenZeppelin/openzeppelin-contracts) from 3.4.2 to 4.9.6.
- [Release notes](https://github.com/OpenZeppelin/openzeppelin-contracts/releases)
- [Changelog](https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/CHANGELOG.md)
- [Commits](OpenZeppelin/openzeppelin-contracts@v3.4.2...v4.9.6)

---
updated-dependencies:
- dependency-name: "@openzeppelin/contracts"
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

examples/waffle/arbitrager/package.json

@@ -8,7 +8,7 @@
     "build": "waffle waffle.json"
   },
   "devDependencies": {
-    "@openzeppelin/contracts": "~3.4.2",
+    "@openzeppelin/contracts": "~4.9.6",
     "@types/chai": "~4.2.22",
     "@types/mocha": "~9.0.0",
     "chai": "~4.3.4",

examples/waffle/e2e/package.json

@@ -22,7 +22,7 @@
     "@acala-network/bodhi": "workspace:*",
     "@acala-network/contracts": "4.3.4",
     "@acala-network/eth-providers": "workspace:*",
-    "@openzeppelin/contracts": "^4.4.2",
+    "@openzeppelin/contracts": "^4.9.6",
     "@polkadot/api": "^10.9.1"
   }
 }

examples/waffle/erc20/package.json

@@ -8,7 +8,7 @@
     "build": "waffle waffle.json"
   },
   "devDependencies": {
-    "@openzeppelin/contracts": "~4.4.2",
+    "@openzeppelin/contracts": "~4.9.6",
     "@types/chai": "~4.2.22",
     "@types/mocha": "~9.0.0",
     "chai": "~4.3.4",

examples/waffle/scheduler/package.json

@@ -8,7 +8,7 @@
     "build": "waffle waffle.json"
   },
   "devDependencies": {
-    "@openzeppelin/contracts": "~3.4.2",
+    "@openzeppelin/contracts": "~4.9.6",
     "@types/chai": "~4.2.22",
     "@types/mocha": "~9.0.0",
     "chai": "~4.3.4",

examples/waffle/uniswap/package.json

@@ -8,7 +8,7 @@
     "build": ""
   },
   "devDependencies": {
-    "@openzeppelin/contracts": "~4.4.2",
+    "@openzeppelin/contracts": "~4.9.6",
     "@types/chai": "~4.2.22",
     "@types/mocha": "~9.0.0",
     "chai": "~4.3.4",