Bump prismjs from 1.20.0 to 1.21.0 in /script-resources/markdown2htmldoc

Bumps [prismjs](https://github.com/PrismJS/prism) from 1.20.0 to 1.21.0.
- [Release notes](https://github.com/PrismJS/prism/releases)
- [Changelog](https://github.com/PrismJS/prism/blob/master/CHANGELOG.md)
- [Commits](https://github.com/PrismJS/prism/compare/v1.20.0...v1.21.0)

Signed-off-by: dependabot[bot] <support@github.com>

script-resources/markdown2htmldoc/package.json

@@ -7,7 +7,7 @@
     "markdown-it": "*",
     "markdown-it-emoji": "*",
     "markdown-it-task-checkbox": "*",
-    "prismjs": "^1.17.1"
+    "prismjs": "^1.21.0"
   },
   "devDependencies": {
     "eslint": "*",

script-resources/markdown2htmldoc/yarn.lock

@@ -897,10 +897,10 @@ prettier@*:
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.0.3.tgz#9a06f0e94a51420e78b6925568b5bec72afe41ea"
   integrity sha512-5qpBDBHO9fpE0zruKiTZm8Gxmz7kknO+WlQR/ivV+RMwgDw/WjOgmxLDn66MPrxq/WZPx/EgEZzh87xJO5E6Fw==
 
-prismjs@^1.17.1:
-  version "1.20.0"
-  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.20.0.tgz#9b685fc480a3514ee7198eac6a3bf5024319ff03"
-  integrity sha512-AEDjSrVNkynnw6A+B1DsFkd6AVdTnp+/WoUixFRULlCLZVRZlVQMVWio/16jv7G1FscUxQxOQhWwApgbnxr6kQ==
+prismjs@^1.21.0:
+  version "1.21.0"
+  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.21.0.tgz#36c086ec36b45319ec4218ee164c110f9fc015a3"
+  integrity sha512-uGdSIu1nk3kej2iZsLyDoJ7e9bnPzIgY0naW/HdknGj61zScaprVEVGHrPoXqI+M9sP0NDnTK2jpkvmldpuqDw==
   optionalDependencies:
     clipboard "^2.0.0"