Bump js-base64 from 2.6.2 to 2.6.4 (#14650)

Bumps [js-base64](https://github.com/dankogai/js-base64) from 2.6.2 to 2.6.4.
- [Release notes](https://github.com/dankogai/js-base64/releases)
- [Commits](https://github.com/dankogai/js-base64/compare/2.6.2...2.6.4)

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

yarn.lock

@@ -6515,9 +6515,9 @@ jest@^26.4.0:
     jest-cli "^26.4.0"
 
 js-base64@^2.1.9:
-  version "2.6.2"
-  resolved "https://registry.yarnpkg.com/js-base64/-/js-base64-2.6.2.tgz#cf9301bc5cc756892a9a6c8d7138322e5944fb0d"
-  integrity sha512-1hgLrLIrmCgZG+ID3VoLNLOSwjGnoZa8tyrUdEteMeIzsT6PH7PMLyUvbDwzNE56P3PNxyvuIOx4Uh2E5rzQIw==
+  version "2.6.4"
+  resolved "https://registry.yarnpkg.com/js-base64/-/js-base64-2.6.4.tgz#f4e686c5de1ea1f867dbcad3d46d969428df98c4"
+  integrity sha512-pZe//GGmwJndub7ZghVHz7vjb2LgC1m8B07Au3eYqeqv9emhESByMXxaEgkUkEqJe87oBbSniGYoQNIBklc7IQ==
 
 js-string-escape@1.0.1:
   version "1.0.1"