build(deps-dev): bump @types/jest from 26.0.20 to 26.0.21 (#611)

Bumps [@types/jest](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/jest) from 26.0.20 to 26.0.21.
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yarn.lock

@@ -471,7 +471,7 @@
     "@types/yargs" "^15.0.0"
     chalk "^4.0.0"
 
-"@jsii/spec@^1.16.0", "@jsii/spec@^1.24.0", "@jsii/spec@^1.25.0":
+"@jsii/spec@^1.16.0", "@jsii/spec@^1.25.0":
   version "1.25.0"
   resolved "https://registry.yarnpkg.com/@jsii/spec/-/spec-1.25.0.tgz#535b85aa26d3db1d188c04300a2e20529eeee7fd"
   integrity sha512-Zr56+uqZLoxI8qxIZZEweZdYBo0KqWf+q25m/okgwcKV4njCZuh0APXzeT/ebSkSOHQ3tneEE+g2EP/8IPP2og==
@@ -602,9 +602,9 @@
     "@types/istanbul-lib-report" "*"
 
 "@types/jest@^26.0.7":
-  version "26.0.20"
-  resolved "https://registry.yarnpkg.com/@types/jest/-/jest-26.0.20.tgz#cd2f2702ecf69e86b586e1f5223a60e454056307"
-  integrity sha512-9zi2Y+5USJRxd0FsahERhBwlcvFh6D2GLQnY2FH2BzK8J9s9omvNHIbvABwIluXa0fD8XVKMLTO0aOEuUfACAA==
+  version "26.0.21"
+  resolved "https://registry.yarnpkg.com/@types/jest/-/jest-26.0.21.tgz#3a73c2731e7e4f0fbaea56ce7ff8c79cf812bd24"
+  integrity sha512-ab9TyM/69yg7eew9eOwKMUmvIZAKEGZYlq/dhe5/0IMUd/QLJv5ldRMdddSn+u22N13FP3s5jYyktxuBwY0kDA==
   dependencies:
     jest-diff "^26.0.0"
     pretty-format "^26.0.0"
@@ -3621,7 +3621,7 @@ jsii-pacmak@^1.24.0:
     xmlbuilder "^15.1.1"
     yargs "^16.2.0"
 
-jsii-reflect@^1.16.0, jsii-reflect@^1.24.0, jsii-reflect@^1.25.0:
+jsii-reflect@^1.16.0, jsii-reflect@^1.25.0:
   version "1.25.0"
   resolved "https://registry.yarnpkg.com/jsii-reflect/-/jsii-reflect-1.25.0.tgz#713727a07b270d61304a122be7cb50e135b8fdf0"
   integrity sha512-ufBgOeGe6WVmx0CO7ABraEYOzhzxvmx6gJuUvOz/8XMe1dIIU2USLW3O1ArkEtIWchN4F2gITdd7I7jhdzzN1A==