fix: upgrade clsx from 1.1.1 to 1.2.1

Snyk has created this PR to upgrade clsx from 1.1.1 to 1.2.1.

See this package in yarn:
clsx

See this project in Snyk:
https://app.snyk.io/org/rr-n4p5t3r-LBkUVa8UFFHbMt6k2B5att/project/b119a91f-63a4-4290-a88c-a6ee31962524?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

docusaurus/package.json

@@ -14,7 +14,7 @@
     "@docusaurus/core": "2.0.0-alpha.65",
     "@docusaurus/preset-classic": "2.0.0-alpha.65",
     "@mdx-js/react": "^1.5.8",
-    "clsx": "^1.1.1",
+    "clsx": "^1.2.1",
     "react": "^16.8.4",
     "react-dom": "^16.8.4"
   },

docusaurus/yarn.lock

@@ -3042,6 +3042,11 @@ clsx@^1.1.1:
   resolved "https://registry.yarnpkg.com/clsx/-/clsx-1.1.1.tgz#98b3134f9abbdf23b2663491ace13c5c03a73188"
   integrity sha512-6/bPho624p3S2pMyvP5kKBPXnI3ufHLObBFCfgx+LkeR5lg2XYy2hqZqUf45ypD8COn2bhgGJSUE+l5dhNBieA==
 
+clsx@^1.2.1:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/clsx/-/clsx-1.2.1.tgz#0ddc4a20a549b59c93a4116bb26f5294ca17dc12"
+  integrity sha512-EcR6r5a8bj6pu3ycsa/E/cKVGuTgZJZdsyUYHOksG/UHIiKfjxzRxYJpyVBwYaQeOvghal9fcc4PidlgzugAQg==
+
 coa@^2.0.2:
   version "2.0.2"
   resolved "https://registry.yarnpkg.com/coa/-/coa-2.0.2.tgz#43f6c21151b4ef2bf57187db0d73de229e3e7ec3"