Update dev deps.

package.json

@@ -37,21 +37,21 @@
     "@digitalbazaar/ed25519-signature-2020": "^5.0.0",
     "@digitalbazaar/ed25519-verification-key-2018": "^4.0.0",
     "@digitalbazaar/vc": "^5.0.0",
-    "c8": "^7.11.3",
+    "c8": "^9.1.0",
     "chai": "^4.3.6",
     "cross-env": "^7.0.3",
     "eslint": "^8.16.0",
-    "eslint-config-digitalbazaar": "^4.2.0",
+    "eslint-config-digitalbazaar": "^5.0.1",
     "eslint-plugin-import": "^2.26.0",
-    "eslint-plugin-jsdoc": "^39.3.2",
-    "eslint-plugin-unicorn": "^45.0.1",
+    "eslint-plugin-jsdoc": "^48.0.2",
+    "eslint-plugin-unicorn": "^50.0.1",
     "karma": "^6.3.20",
     "karma-babel-preprocessor": "^8.0.2",
     "karma-chai": "^0.1.0",
     "karma-chrome-launcher": "^3.1.1",
     "karma-mocha": "^2.0.1",
     "karma-mocha-reporter": "^2.2.5",
-    "karma-sourcemap-loader": "^0.3.8",
+    "karma-sourcemap-loader": "^0.4.0",
     "karma-webpack": "^5.0.0",
     "mocha": "^10.0.0",
     "mocha-lcov-reporter": "^1.3.0",