Bump prismjs from 1.18.0 to 1.21.0 (#398)

Bumps [prismjs](https://github.com/PrismJS/prism) from 1.18.0 to 1.21.0.
- [Release notes](https://github.com/PrismJS/prism/releases)
- [Changelog](https://github.com/PrismJS/prism/blob/master/CHANGELOG.md)
- [Commits](PrismJS/prism@v1.18.0...v1.21.0)

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

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

Author: dependabot[bot]

yarn.lock

@@ -2289,9 +2289,9 @@ clipboard-copy@^3.1.0:
   integrity sha512-Xsu1NddBXB89IUauda5BIq3Zq73UWkjkaQlPQbLNvNsd5WBMnTWPNKYR6HGaySOxGYZ+BKxP2E9X4ElnI3yiPA==
 
 clipboard@^2.0.0:
-  version "2.0.4"
-  resolved "https://registry.yarnpkg.com/clipboard/-/clipboard-2.0.4.tgz#836dafd66cf0fea5d71ce5d5b0bf6e958009112d"
-  integrity sha512-Vw26VSLRpJfBofiVaFb/I8PVfdI1OxKcYShe6fm0sP/DtmiWQNCjhM/okTvdCo0G+lMMm1rMYbk4IK4x1X+kgQ==
+  version "2.0.6"
+  resolved "https://registry.yarnpkg.com/clipboard/-/clipboard-2.0.6.tgz#52921296eec0fdf77ead1749421b21c968647376"
+  integrity sha512-g5zbiixBRk/wyKakSwCKd7vQXDjFnAMGHoEyBogG/bw9kTD9GvdAvaoRR1ALcEzt3pVKxZR0pViekPMIS0QyGg==
   dependencies:
     good-listener "^1.2.2"
     select "^1.1.2"
@@ -7385,9 +7385,9 @@ pretty-hrtime@^1.0.3:
   integrity sha1-t+PqQkNaTJsnWdmeDyAesZWALuE=
 
 prismjs@^1.17.1:
-  version "1.18.0"
-  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.18.0.tgz#8f04dd47fa232cbd27d1ca969107580ff43f06e4"
-  integrity sha512-N0r3i/Cto516V8+GKKamhsPVZSFcO0TMUBtIDW6uq6BVqoC3FNtZVZ+cmH16N2XtGQlgRN+sFUTjOdCsEP51qw==
+  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"