fix(deps): bump @salesforce/ts-types from 1.5.20 to 1.5.21

Bumps [@salesforce/ts-types](https://github.com/forcedotcom/ts-types) from 1.5.20 to 1.5.21.
- [Release notes](https://github.com/forcedotcom/ts-types/releases)
- [Changelog](https://github.com/forcedotcom/ts-types/blob/v1.5.21/CHANGELOG.md)
- [Commits](https://github.com/forcedotcom/ts-types/commits/v1.5.21)

---
updated-dependencies:
- dependency-name: "@salesforce/ts-types"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

package.json

@@ -40,7 +40,7 @@
     "@oclif/test": "^2.1.0",
     "@salesforce/core": "^3.26.2",
     "@salesforce/kit": "^1.6.0",
-    "@salesforce/ts-types": "^1.5.20",
+    "@salesforce/ts-types": "^1.5.21",
     "chalk": "^2.4.2"
   },
   "devDependencies": {

yarn.lock

@@ -810,10 +810,10 @@
     sinon "^5.1.1"
     tslib "^2.2.0"
 
-"@salesforce/ts-types@^1.5.20":
-  version "1.5.20"
-  resolved "https://registry.npmjs.org/@salesforce/ts-types/-/ts-types-1.5.20.tgz#f6875a710ceca48223b240026a14af6d3b39882f"
-  integrity sha512-Ov6um4CWd63EvkRavkHG0J/P9XYL55sdkDWPMr7+AIgqh5flHxDRz09/C4e9M94aX30rzJxW4TVX6EBf4Cu2BQ==
+"@salesforce/ts-types@^1.5.20", "@salesforce/ts-types@^1.5.21":
+  version "1.5.21"
+  resolved "https://registry.yarnpkg.com/@salesforce/ts-types/-/ts-types-1.5.21.tgz#e62784872f0e74bf4ae13381dc58aa4644ee2df3"
+  integrity sha512-qG8r8WOzqpFOHaH3EGU3IwGrY/pSv9NQp4B0wGxOuPDBbraXVvd3KhWVStxaLGKBkJClJ7/+t+iCSP82sEiGcg==
   dependencies:
     tslib "^2.2.0"