Bump ajv from 6.9.1 to 6.12.6

Bumps [ajv](https://github.com/ajv-validator/ajv) from 6.9.1 to 6.12.6.
- [Release notes](https://github.com/ajv-validator/ajv/releases)
- [Commits](ajv-validator/ajv@v6.9.1...v6.12.6)

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

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

yarn.lock

@@ -307,11 +307,11 @@ agent-base@^4.3.0:
     es6-promisify "^5.0.0"
 
 ajv@^6.9.1:
-  version "6.9.1"
-  resolved "https://registry.npmjs.org/ajv/-/ajv-6.9.1.tgz"
-  integrity sha512-XDN92U311aINL77ieWHmqCcNlwjoP5cHXDxIxbf2MaPYuCXOHS7gHH8jktxeK5omgd52XbSTX6a4Piwd1pQmzA==
+  version "6.12.6"
+  resolved "https://registry.yarnpkg.com/ajv/-/ajv-6.12.6.tgz#baf5a62e802b07d977034586f8c3baf5adf26df4"
+  integrity sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==
   dependencies:
-    fast-deep-equal "^2.0.1"
+    fast-deep-equal "^3.1.1"
     fast-json-stable-stringify "^2.0.0"
     json-schema-traverse "^0.4.1"
     uri-js "^4.2.2"
@@ -1446,10 +1446,10 @@ extglob@^2.0.4:
     snapdragon "^0.8.1"
     to-regex "^3.0.1"
 
-fast-deep-equal@^2.0.1:
-  version "2.0.1"
-  resolved "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-2.0.1.tgz"
-  integrity sha1-ewUhjd+WZ79/Nwv3/bLLFf3Qqkk=
+fast-deep-equal@^3.1.1:
+  version "3.1.3"
+  resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz#3a7d56b559d6cbc3eb512325244e619a65c6c525"
+  integrity sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q==
 
 fast-diff@^1.1.2:
   version "1.2.0"