Upgrade TypeScript and tslib to the latest versions (#17)

We need TypeScript 4.6+ to be able to construct Error objects with the
cause property[1]. The property is useful to chain errors and, on the
catching side, to see what error caused the error we just caught.

I want to have this in place to implement [3] which satisfies a need we
ourselves have[4].

tslib upgraded in lockstep because otherwise we get

    FAIL  test/result.test.ts
      ● Test suite failed to run

        test/result.test.ts:121:29 - error TS2807: This syntax requires an imported helper named '__spreadArray' with 3 parameters, which is not compatible with the one in 'tslib'. Consider upgrading your version of 'tslib'.

        121     const all4 = Result.all(...([] as Result<string, number>[]));
                                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[1] https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/Error
[2] microsoft/TypeScript#45167
[3] vultix#34
[4] vultix#48

package.json

@@ -26,7 +26,7 @@
     "prettier": "^2.2.1",
     "rxjs": "^6.6.7",
     "ts-jest": "^26.5.4",
-    "tslib": "^2.1.0",
-    "typescript": "^4.2"
+    "tslib": "^2.3.1",
+    "typescript": "^4.6.3"
   }
 }