build(deps): bump debug from 2.6.7 to 2.6.9

Bumps [debug](https://github.com/visionmedia/debug) from 2.6.7 to 2.6.9.
- [Release notes](https://github.com/visionmedia/debug/releases)
- [Changelog](https://github.com/visionmedia/debug/blob/2.6.9/CHANGELOG.md)
- [Commits](debug-js/debug@2.6.7...2.6.9)

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

yarn.lock

@@ -917,9 +917,10 @@ date-now@^0.1.4:
   version "0.1.4"
   resolved "https://registry.yarnpkg.com/date-now/-/date-now-0.1.4.tgz#eaf439fd4d4848ad74e5cc7dbef200672b9e345b"
 
-[email protected], debug@^2.1.2, debug@^2.3.3:
+[email protected], debug@^2.1.2, debug@^2.2.0, debug@^2.3.3:
   version "2.6.9"
   resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.9.tgz#5d128515df134ff327e90a4c93f4e077a536341f"
+  integrity sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==
   dependencies:
     ms "2.0.0"
 
@@ -929,12 +930,6 @@ [email protected]:
   dependencies:
     ms "^2.1.1"
 
-debug@^2.2.0:
-  version "2.6.7"
-  resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.7.tgz#92bad1f6d05bbb6bba22cca88bcd0ec894c2861e"
-  dependencies:
-    ms "2.0.0"
-
 decamelize@^1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/decamelize/-/decamelize-1.2.0.tgz#f6534d15148269b20352e7bee26f501f9a191290"
@@ -2260,6 +2255,7 @@ move-concurrently@^1.0.1:
 [email protected]:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.0.0.tgz#5608aeadfc00be6c2901df5f9861788de0d597c8"
+  integrity sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=
 
 [email protected], ms@^2.1.1:
   version "2.1.1"