Bump tippy.js from 4.3.5 to 6.3.7

Bumps [tippy.js](https://github.com/atomiks/tippyjs) from 4.3.5 to 6.3.7.
- [Release notes](https://github.com/atomiks/tippyjs/releases)
- [Commits](atomiks/tippyjs@v4.3.5...v6.3.7)

---
updated-dependencies:
- dependency-name: tippy.js
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

package.json

@@ -32,7 +32,7 @@
     "lodash": "^4.17.15",
     "popper.js": "^1.14.6",
     "purecss": "^0.6.2",
-    "tippy.js": "^4.2.1"
+    "tippy.js": "^6.3.7"
   },
   "peerDependencies": {},
   "devDependencies": {

yarn.lock

@@ -1760,6 +1760,11 @@
     mustache "^2.3.0"
     stack-trace "0.0.10"
 
+"@popperjs/core@^2.9.0":
+  version "2.11.6"
+  resolved "https://registry.yarnpkg.com/@popperjs/core/-/core-2.11.6.tgz#cee20bd55e68a1720bdab363ecf0c821ded4cd45"
+  integrity sha512-50/17A98tWUfQ176raKiOGXuYpLyyVMkxxG6oylzL3BPOlA6ADGdK7EYunSa4I064xerltq9TGXs8HmOk5E+vw==
+
 "@romainberger/css-diff@^1.0.3":
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/@romainberger/css-diff/-/css-diff-1.0.3.tgz#ced387535d4f42a42ac1fe13c09de97f5ae1344c"
@@ -14203,6 +14208,13 @@ tippy.js@^4.2.1:
   dependencies:
     popper.js "^1.14.7"
 
+tippy.js@^6.3.7:
+  version "6.3.7"
+  resolved "https://registry.yarnpkg.com/tippy.js/-/tippy.js-6.3.7.tgz#8ccfb651d642010ed9a32ff29b0e9e19c5b8c61c"
+  integrity sha512-E1d3oP2emgJ9dRQZdf3Kkn0qJgI6ZLpyS5z6ZkY1DF3kaQaBsGZsndEpHwx+eC+tYM41HaSNvNtLx8tU57FzTQ==
+  dependencies:
+    "@popperjs/core" "^2.9.0"
+
 tmp@^0.0.33:
   version "0.0.33"
   resolved "https://registry.yarnpkg.com/tmp/-/tmp-0.0.33.tgz#6d34335889768d21b2bcda0aa277ced3b1bfadf9"