build: upgrade husky to avoid errors in git hooks

Husky is tricky because it permanently installs hooks in your repo,
which means that they will run on branches where husky isn't installed
(like v1-stable). Because husky doesn't exist there, those hooks were
causing errors, but the latest husky release modifies those to prevent
failures.

yarn.lock

@@ -2631,8 +2631,8 @@ chownr@^1.0.1:
   resolved "https://registry.yarnpkg.com/chownr/-/chownr-1.0.1.tgz#e2a75042a9551908bebd25b8523d5f9769d79181"
 
 ci-info@^1.0.0:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/ci-info/-/ci-info-1.1.1.tgz#47b44df118c48d2597b56d342e7e25791060171a"
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/ci-info/-/ci-info-1.1.3.tgz#710193264bb05c77b8c90d02f5aaf22216a667b2"
 
 cipher-base@^1.0.0, cipher-base@^1.0.1, cipher-base@^1.0.3:
   version "1.0.4"
@@ -5069,16 +5069,15 @@ https-proxy-agent@^2.2.0:
     debug "^3.1.0"
 
 husky@^1.0.0-rc.8:
-  version "1.0.0-rc.8"
-  resolved "https://registry.yarnpkg.com/husky/-/husky-1.0.0-rc.8.tgz#2fa25d0b89269f5b8bfa1ca001370fdb058e8792"
+  version "1.0.0-rc.9"
+  resolved "https://registry.yarnpkg.com/husky/-/husky-1.0.0-rc.9.tgz#9455788056b003327cff38f5c72285bb3ca485e9"
   dependencies:
     cosmiconfig "^5.0.2"
     execa "^0.9.0"
     find-up "^2.1.0"
     get-stdin "^6.0.0"
     is-ci "^1.1.0"
     pkg-dir "^2.0.0"
-    pupa "^1.0.0"
     read-pkg "^3.0.0"
     run-node "^1.0.0"
     slash "^2.0.0"
@@ -5949,7 +5948,7 @@ js-tokens@^3.0.0, js-tokens@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-3.0.2.tgz#9866df395102130e38f7f996bceb65443209c25b"
 
-js-yaml@^3.4.3, js-yaml@^3.5.2:
+js-yaml@^3.4.3, js-yaml@^3.5.2, js-yaml@^3.9.0:
   version "3.12.0"
   resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.12.0.tgz#eaed656ec8344f10f527c6bfa1b6e2244de167d1"
   dependencies:
@@ -5963,13 +5962,6 @@ js-yaml@^3.5.1, js-yaml@^3.7.0:
     argparse "^1.0.7"
     esprima "^4.0.0"
 
-js-yaml@^3.9.0:
-  version "3.11.0"
-  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.11.0.tgz#597c1a8bd57152f26d622ce4117851a51f5ebaef"
-  dependencies:
-    argparse "^1.0.7"
-    esprima "^4.0.0"
-
 js-yaml@~3.7.0:
   version "3.7.0"
   resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.7.0.tgz#5c967ddd837a9bfdca5f2de84253abe8a1c03b80"
@@ -7943,10 +7935,6 @@ punycode@^2.1.0:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/punycode/-/punycode-2.1.1.tgz#b58b010ac40c22c5657616c8d2c2c02c7bf479ec"
 
-pupa@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/pupa/-/pupa-1.0.0.tgz#9a9568a5af7e657b8462a6e9d5328743560ceff6"
-
 q@^1.1.2, q@^1.5.1:
   version "1.5.1"
   resolved "https://registry.yarnpkg.com/q/-/q-1.5.1.tgz#7e32f75b41381291d04611f1bf14109ac00651d7"