Bump ajv from 6.12.6 to 6.15.0 in /addon

Bumps [ajv](https://github.com/ajv-validator/ajv) from 6.12.6 to 6.15.0.
- [Release notes](https://github.com/ajv-validator/ajv/releases)
- [Commits](https://github.com/ajv-validator/ajv/compare/v6.12.6...v6.15.0)

---
updated-dependencies:
- dependency-name: ajv
  dependency-version: 6.15.0
  dependency-type: indirect
...

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

addon/package-lock.json

@@ -137,7 +137,6 @@
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       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "cluster-key-slot": "1.1.2"
       },
@@ -235,9 +234,10 @@
       }
     },
     "node_modules/ajv": {
-      "version": "6.12.6",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
-      "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
+      "version": "6.15.0",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.15.0.tgz",
+      "integrity": "sha512-fgFx7Hfoq60ytK2c7DhnF8jIvzYgOMxfugjLOSMHjLIPgenqa7S7oaagATUq99mV6IYvN2tRmC0wnTYX6iPbMw==",
+      "license": "MIT",
       "dependencies": {
         "fast-deep-equal": "^3.1.1",
         "fast-json-stable-stringify": "^2.0.0",
@@ -885,7 +885,6 @@
       "resolved": "https://registry.npmjs.org/express/-/express-4.22.1.tgz",
       "integrity": "sha512-F2X8g9P1X7uCPZMA3MVf9wcTqlyNp7IhH5qPCI0izhaOIYXaW9L535tGA3qmjRzpH+bZczqq7hVKxTR4NWnu+g==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "accepts": "~1.3.8",
         "array-flatten": "1.1.1",
@@ -932,7 +931,6 @@
       "resolved": "https://registry.npmjs.org/express-rate-limit/-/express-rate-limit-8.2.1.tgz",
       "integrity": "sha512-PCZEIEIxqwhzw4KF0n7QF4QqruVTcF73O5kFKUnGOyjbCCgizBBiFaYpd/fnBLUMPw/BWw9OsiN7GgrNYr7j6g==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "ip-address": "10.0.1"
       },
@@ -1503,7 +1501,6 @@
       "resolved": "https://registry.npmjs.org/keyv/-/keyv-5.6.0.tgz",
       "integrity": "sha512-CYDD3SOtsHtyXeEORYRx2qBtpDJFjRTGXUtmNEMGyzYOKj1TE3tycdlho7kA1Ufx9OYWZzg52QFBGALTirzDSw==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@keyv/serialize": "^1.1.1"
       }
@@ -1970,7 +1967,6 @@
       "resolved": "https://registry.npmjs.org/pg/-/pg-8.16.3.tgz",
       "integrity": "sha512-enxc1h0jA/aq5oSDMvqyW3q89ra6XIIDZgCX9vkMrnz5DFTw/Ny3Li2lFQ+pt3L6MCgm/5o2o8HW9hiJji+xvw==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "pg-connection-string": "^2.9.1",
         "pg-pool": "^3.10.1",
@@ -2101,7 +2097,6 @@
       "resolved": "https://registry.npmjs.org/prom-client/-/prom-client-14.2.0.tgz",
       "integrity": "sha512-sF308EhTenb/pDRPakm+WgiN+VdM/T1RaHj1x+MvAuT8UiQP8JmOEbxVqtkbfR4LrvOg5n7ic01kRBDGXjYikA==",
       "license": "Apache-2.0",
-      "peer": true,
       "dependencies": {
         "tdigest": "^0.1.1"
       },