build(deps-dev): bump sign-addon from 3.0.0 to 3.1.0 in /web

Bumps [sign-addon](https://github.com/mozilla/sign-addon) from 3.0.0 to 3.1.0.
- [Release notes](https://github.com/mozilla/sign-addon/releases)
- [Commits](https://github.com/mozilla/sign-addon/compare/3.0.0...3.1.0)

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

web/package-lock.json

@@ -5505,9 +5505,9 @@
       "dev": true
     },
     "deepcopy": {
-      "version": "2.0.0",
+      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/deepcopy/-/deepcopy-2.0.0.tgz",
+      "resolved": "https://registry.npmjs.org/deepcopy/-/deepcopy-2.1.0.tgz",
-      "integrity": "sha512-d5ZK7pJw7F3k6M5vqDjGiiUS9xliIyWkdzBjnPhnSeRGjkYOGZMCFkdKVwV/WiHOe0NwzB8q+iDo7afvSf0arA==",
+      "integrity": "sha512-8cZeTb1ZKC3bdSCP6XOM1IsTczIO73fdqtwa2B0N15eAz7gmyhQo+mc5gnFuulsgN3vIQYmTgbmQVKalH1dKvQ==",
       "dev": true,
       "requires": {
         "type-detect": "^4.0.8"
@@ -12177,14 +12177,14 @@
       "dev": true
     },
     "sign-addon": {
-      "version": "3.0.0",
+      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/sign-addon/-/sign-addon-3.0.0.tgz",
+      "resolved": "https://registry.npmjs.org/sign-addon/-/sign-addon-3.1.0.tgz",
-      "integrity": "sha512-MQ2lqVFVqk7RHKuQ758MtkCgBzwc8OKo+k/vwgYsltrDckYKmviMGe+cb1bUD1qeZLn1kTbnhcK7HqHvNhF9Gg==",
+      "integrity": "sha512-zZ7nKc5/3QWM3skYBosGDvYQf2jkKhW2u8BELrZoN1wgCSOnwsV9T47Vx9uaNbA3CyZ+V9XSA0tDVHoV1QfVPw==",
       "dev": true,
       "requires": {
         "common-tags": "1.8.0",
         "core-js": "3.6.5",
-        "deepcopy": "2.0.0",
+        "deepcopy": "2.1.0",
         "es6-error": "4.1.1",
         "es6-promisify": "6.1.1",
         "jsonwebtoken": "8.5.1",