chore(deps): bump prismjs from 1.20.0 to 1.21.0

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](PrismJS/prism@v1.20.0...v1.21.0)

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

Author: dependabot[bot]

package-lock.json

@@ -36,7 +36,7 @@
     "hammerjs": "2.0.8",
     "ngx-perfect-scrollbar": "10.0.1",
     "nodemon": "2.0.4",
-    "prismjs": "1.20.0",
+    "prismjs": "1.21.0",
     "rxjs": "6.6.2",
     "rxjs-compat": "6.6.2",
     "tslib": "2.0.0",