Bump ts-jest from 26.5.2 to 26.5.4 in /tests

Bumps [ts-jest](https://github.com/kulshekhar/ts-jest) from 26.5.2 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@v26.5.2...v26.5.4)

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

tests/package.json

@@ -57,7 +57,7 @@
     "tail": "^2.2.0",
     "temp-write": "^4.0.0",
     "tmp": "^0.2.1",
-    "ts-jest": "^26.5.2",
+    "ts-jest": "^26.5.4",
     "ts-node": "^9.1.1",
     "tslint": "^6.1.3",
     "tslint-no-unused-expression-chai": "^0.1.4",

tests/yarn.lock

@@ -971,7 +971,7 @@
   dependencies:
     "@types/istanbul-lib-report" "*"
 
-"@types/jest@26.x", "@types/jest@^26.0.20":
+"@types/jest@^26.0.20":
   version "26.0.20"
   resolved "https://registry.yarnpkg.com/@types/jest/-/jest-26.0.20.tgz#cd2f2702ecf69e86b586e1f5223a60e454056307"
   integrity sha512-9zi2Y+5USJRxd0FsahERhBwlcvFh6D2GLQnY2FH2BzK8J9s9omvNHIbvABwIluXa0fD8XVKMLTO0aOEuUfACAA==
@@ -5430,12 +5430,11 @@ trim-repeated@^1.0.0:
   dependencies:
     escape-string-regexp "^1.0.2"
 
-ts-jest@^26.5.2:
-  version "26.5.2"
-  resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-26.5.2.tgz#5281d6b44c2f94f71205728a389edc3d7995b0c4"
-  integrity sha512-bwyJ2zJieSugf7RB+o8fgkMeoMVMM2KPDE0UklRLuACxjwJsOrZNo6chrcScmK33YavPSwhARffy8dZx5LJdUQ==
+ts-jest@^26.5.4:
+  version "26.5.4"
+  resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-26.5.4.tgz#207f4c114812a9c6d5746dd4d1cdf899eafc9686"
+  integrity sha512-I5Qsddo+VTm94SukBJ4cPimOoFZsYTeElR2xy6H2TOVs+NsvgYglW8KuQgKoApOKuaU/Ix/vrF9ebFZlb5D2Pg==
   dependencies:
-    "@types/jest" "26.x"
     bs-logger "0.x"
     buffer-from "1.x"
     fast-json-stable-stringify "2.x"