fix(deps): bump tslib from 2.5.3 to 2.6.0

Bumps [tslib](https://github.com/Microsoft/tslib) from 2.5.3 to 2.6.0.
- [Release notes](https://github.com/Microsoft/tslib/releases)
- [Commits](microsoft/tslib@v2.5.3...2.6.0)

---
updated-dependencies:
- dependency-name: tslib
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

package.json

@@ -14,7 +14,7 @@
   "dependencies": {
     "@salesforce/ts-types": "^2.0.2",
     "sinon": "^5.1.1",
-    "tslib": "^2.5.3"
+    "tslib": "^2.6.0"
   },
   "devDependencies": {
     "@salesforce/dev-config": "^4.0.1",

yarn.lock

@@ -3675,10 +3675,10 @@ tslib@^1.8.1:
   resolved "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz#cf2d38bdc34a134bcaf1091c41f6619e2f672d00"
   integrity sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==
 
-tslib@^2.5.3:
-  version "2.5.3"
-  resolved "https://registry.npmjs.org/tslib/-/tslib-2.5.3.tgz#24944ba2d990940e6e982c4bea147aba80209913"
-  integrity sha512-mSxlJJwl3BMEQCUNnxXBU9jP4JBktcEGhURcPR6VQVlnP0FdDEsIaz0C35dXNGLyRfrATNofF0F5p2KPxQgB+w==
+tslib@^2.5.3, tslib@^2.6.0:
+  version "2.6.0"
+  resolved "https://registry.npmjs.org/tslib/-/tslib-2.6.0.tgz#b295854684dbda164e181d259a22cd779dcd7bc3"
+  integrity sha512-7At1WUettjcSRHXCyYtTselblcHl9PJFFVKiCAy/bY97+BPZXSQ2wbq0P9s8tK2G7dFQfNnlJnPAiArVBVBsfA==
 
 tsutils@^3.21.0:
   version "3.21.0"