Use patched version of package wai.

Fixes:
https://buildkite.com/cardano-foundation/cardano-wallet/builds/5240#01900a67-445e-447e-b1bd-976ebaf665c1/39-41

Error:
```
> Network/Wai/Application/Static.hs:260:27: error: [GHC-87897]
>     • Exception when trying to run compile-time code:
>         Z:\build\wai-app-static-3.1.9\images/folder.png: withBinaryFile: invalid argument (Bad file descriptor)
>       Code: (makeRelativeToProject "images/folder.png" >>= embedFile)
>     • In the untyped splice:
>         $(makeRelativeToProject "images/folder.png" >>= embedFile)
>     |
> 260 |             L.fromChunks [$(makeRelativeToProject "images/folder.png" >>= embedFile)]
>     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
```

cabal.project

@@ -158,6 +158,13 @@ source-repository-package
 
 --------------------------------------------------------------------------------
 
+source-repository-package
+    type: git
+    location: https://github.com/jonathanknowles/wai.git
+    tag: 5ad3d1a5d472f398ded8817b0befc221a7a84cef
+    --sha256: 1nlbsqar46i9yzl8j5i8wwmya34n82b9zcnik27q3n43rxnvi1ri
+    subdir: wai-app-static
+
 source-repository-package
     type: git
     location: https://github.com/paolino/int-cast.git