Require TS 5.1 for next-pwa (DefinitelyTyped#65565)

This is a requirement relevant mainly for testing on DT; DT uses
`typeRoots` to redirect packages like react to `@types/react`. But
versions previous to 5.1 had a triple-slash resolution bug when
typeRoots was set [that was only fixed in
5.1](microsoft/TypeScript#51715).

An alternative fix is to move react/experimental.d.ts to
react/experimental/index.d.ts (and the same for react-dom), but I doubt
this bug affects anybody but people who need to change next-pwa on DT,
so I think it's easier to change next-pwa instead.

Author: sandersn

types/next-pwa/index.d.ts

@@ -2,7 +2,7 @@
 // Project: https://github.com/shadowwalker/next-pwa#readme
 // Definitions by: Nivaldo Farias <https://github.com/NivaldoFarias>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-// Minimum TypeScript Version: 4.5
+// Minimum TypeScript Version: 5.1
 
 /// <reference types="react"/>