frontend-test-utils: fix implicit any types for TypeScript 6 compatibility

Add explicit type annotations to `.map()` callback parameters in
`renderInTestApp` to prevent TS7006 errors with TypeScript 6, and
update `@mswjs/interceptors` to 0.39.8 within the existing version
range.

Signed-off-by: Fredrik Adelöw <freben@spotify.com>
Made-with: Cursor

yarn.lock

@@ -11908,8 +11908,8 @@ __metadata:
   linkType: hard
 
 "@mswjs/interceptors@npm:^0.39.1":
-  version: 0.39.6
-  resolution: "@mswjs/interceptors@npm:0.39.6"
+  version: 0.39.8
+  resolution: "@mswjs/interceptors@npm:0.39.8"
   dependencies:
     "@open-draft/deferred-promise": "npm:^2.2.0"
     "@open-draft/logger": "npm:^0.3.0"
@@ -11917,7 +11917,7 @@ __metadata:
     is-node-process: "npm:^1.2.0"
     outvariant: "npm:^1.4.3"
     strict-event-emitter: "npm:^0.5.1"
-  checksum: 10/c87d3edf08353bde825c87b151b24d538070540ab419206cef1774c932e888af0f920183182fb7c94c3eee42068da5a0a5855853fded8514f33c870921ef37ec
+  checksum: 10/d92546cf9bf670ddb927c53f5fa19f0554b7475a264ead4e1ae2339874f4312fe4ada5d42588f27eea3577bee29fa8f46889d398f0e7ecb3f7a4c1d3e0b71bdc
   languageName: node
   linkType: hard