npm: bump ts-jest from 26.4.4 to 26.5.4

Bumps [ts-jest](https://github.com/kulshekhar/ts-jest) from 26.4.4 to 26.5.4.
- [Release notes](https://github.com/kulshekhar/ts-jest/releases)
- [Changelog](https://github.com/kulshekhar/ts-jest/blob/master/CHANGELOG.md)
- [Commits](kulshekhar/ts-jest@v26.4.4...v26.5.4)

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

package.json

@@ -12,8 +12,9 @@
         "format": "prettier --single-quote --write **/*.ts",
         "format:check": "prettier --check **/*.ts",
         "lint": "eslint --cache --fix --quiet --format codeframe --ext js,ts .",
+        "markdown": "markdown-link-check ./README.md ./SECURITY.md",
         "remark": "remark -q -f .",
-        "build:docs": "typedoc --out docs/ts api typings utils --excludeNotDocumented --tsconfig tsconfig.json",
+        "docs": "typedoc --out docs/ts api typings utils --excludeNotDocumented --tsconfig tsconfig.json",
         "reinstall": "del-cli ./node_modules ./package-lock.json ./yarn.lock",
         "index": "node scripts/createIndex.js",
         "postreinstall": "yarn setup",
@@ -64,13 +65,14 @@
         "remark-lint-code-block-style": "^2.0.1",
         "remark-lint-ordered-list-marker-value": "^2.0.1",
         "typedoc": "^0.20.28",
+        "markdown-link-check": "^3.8.6",
         "husky": "^5.0.8",
         "jest": "^26.6.3",
         "jest-circus": "^26.6.3",
         "prettier": "^2.1.2",
         "randomcolor": "^0.5.4",
         "semantic-release": ">=17.2.3",
-        "ts-jest": "^26.4.4",
+        "ts-jest": "^26.5.4",
         "ts-node": ">=9.0.0",
         "typescript": "^4.1.3"
     },