Bump graphql-playground-html in /examples/markdown-docs (#219)

Bumps [graphql-playground-html](https://github.com/graphcool/graphql-playground) from 1.6.19 to 1.6.25.
- [Release notes](https://github.com/graphcool/graphql-playground/releases)
- [Commits](https://github.com/graphcool/graphql-playground/commits)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Jacob Bolda <[email protected]>

packages/gatsby-source-airtable/examples/markdown-docs/yarn.lock

@@ -4219,6 +4219,11 @@ commander@^2.11.0, commander@^2.20.0:
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.0.tgz#d58bb2b5c1ee8f87b0d340027e9e94e222c5a422"
   integrity sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ==
 
+commander@^2.20.3:
+  version "2.20.3"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.3.tgz#fd485e84c03eb4881c20722ba48035e8531aeb33"
+  integrity sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==
+
 common-tags@^1.8.0:
   version "1.8.0"
   resolved "https://registry.yarnpkg.com/common-tags/-/common-tags-1.8.0.tgz#8e3153e542d4a39e9b10554434afaaf98956a937"
@@ -4709,6 +4714,11 @@ cssesc@^2.0.0:
   resolved "https://registry.yarnpkg.com/cssesc/-/cssesc-2.0.0.tgz#3b13bd1bb1cb36e1bcb5a4dcd27f54c5dcb35703"
   integrity sha512-MsCAG1z9lPdoO/IUMLSBWBSVxVtJ1395VGIQ+Fc2gNdkQ1hNDnQdw3YhA71WJCBW1vdwA0cAnk/DnW6bqoEUYg==
 
+[email protected]:
+  version "0.0.10"
+  resolved "https://registry.yarnpkg.com/cssfilter/-/cssfilter-0.0.10.tgz#c6d2672632a2e5c83e013e6864a42ce8defd20ae"
+  integrity sha1-xtJnJjKi5cg+AT5oZKQs6N79IK4=
+
 cssnano-preset-default@^4.0.7:
   version "4.0.7"
   resolved "https://registry.yarnpkg.com/cssnano-preset-default/-/cssnano-preset-default-4.0.7.tgz#51ec662ccfca0f88b396dcd9679cdb931be17f76"
@@ -7316,9 +7326,11 @@ graphql-import@^0.7.1:
     resolve-from "^4.0.0"
 
 graphql-playground-html@^1.6.19:
-  version "1.6.19"
-  resolved "https://registry.yarnpkg.com/graphql-playground-html/-/graphql-playground-html-1.6.19.tgz#3883ecf5e8c18b3c0f08145b5417b9c01a1f0bef"
-  integrity sha512-cLAqoOlxHbGj/LBpr4l2BE9qXf3g8ShjQqU2daVueITI/3wIkcDQTaQaQp+HWv0uaX0dCsgMCFW/TooLj8yJOg==
+  version "1.6.25"
+  resolved "https://registry.yarnpkg.com/graphql-playground-html/-/graphql-playground-html-1.6.25.tgz#2d8fa250cec4036a4f5b7f8ad069c86d6d64c95f"
+  integrity sha512-wMNvGsQ0OwBVhn72VVi7OdpI85IxiIZT43glRx7gQIwQ6NvhFnzMYBIVmcJAJ4UlXRYiWtrQhuOItDXObiR3kg==
+  dependencies:
+    xss "^1.0.6"
 
 graphql-playground-middleware-express@^1.7.15:
   version "1.7.15"
@@ -14891,6 +14903,14 @@ xregexp@^4.3.0:
   dependencies:
     "@babel/runtime-corejs3" "^7.8.3"
 
+xss@^1.0.6:
+  version "1.0.7"
+  resolved "https://registry.yarnpkg.com/xss/-/xss-1.0.7.tgz#a554cbd5e909324bd6893fb47fff441ad54e2a95"
+  integrity sha512-A9v7tblGvxu8TWXQC9rlpW96a+LN1lyw6wyhpTmmGW+FwRMactchBR3ROKSi33UPCUcUHSu8s9YP6F+K3Mw//w==
+  dependencies:
+    commander "^2.20.3"
+    cssfilter "0.0.10"
+
 xstate@^4.10.0:
   version "4.10.0"
   resolved "https://registry.yarnpkg.com/xstate/-/xstate-4.10.0.tgz#f87e4ef593fe40300b8eec50a5d9f0763aa4f622"