Bump image-size from 1.1.1 to 1.2.1 in /docs

Bumps [image-size](https://github.com/image-size/image-size) from 1.1.1 to 1.2.1.
- [Release notes](https://github.com/image-size/image-size/releases)
- [Commits](image-size/image-size@v1.1.1...v1.2.1)

---
updated-dependencies:
- dependency-name: image-size
  dependency-type: indirect
...

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

Author: dependabot[bot]

docs/yarn.lock

@@ -8059,9 +8059,9 @@ ignore@^5.2.0, ignore@^5.2.4, ignore@^5.3.1:
   integrity sha512-hsBTNUqQTDwkWtcdYI2i06Y/nUBEsNEDJKjWdigLvegy8kDuJAS8uRlpkkcQpyEXL0Z/pjDy5HBmMjRCJ2gq+g==
 
 image-size@^1.0.2:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/image-size/-/image-size-1.1.1.tgz#ddd67d4dc340e52ac29ce5f546a09f4e29e840ac"
-  integrity sha512-541xKlUw6jr/6gGuk92F+mYM5zaFAc5ahphvkqvNe2bQ6gVBkd6bfrmVJ2t4KDAfikAYZyIqTnktX3i6/aQDrQ==
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/image-size/-/image-size-1.2.1.tgz#ee118aedfe666db1a6ee12bed5821cde3740276d"
+  integrity sha512-rH+46sQJ2dlwfjfhCyNx5thzrv+dtmBIhPHk0zgRUukHzZ/kRueTJXoYYsclBaKcSMBWuGbOFXtioLpzTb5euw==
   dependencies:
     queue "6.0.2"