build: bump github.com/govuk-one-login/mobile-ios-networking (#127)

Bumps [github.com/govuk-one-login/mobile-ios-networking](https://github.com/govuk-one-login/mobile-ios-networking) from 3.6.0 to 4.0.0.
- [Release notes](https://github.com/govuk-one-login/mobile-ios-networking/releases)
- [Commits](govuk-one-login/mobile-ios-networking@3.6.0...4.0.0)

---
updated-dependencies:
- dependency-name: github.com/govuk-one-login/mobile-ios-networking
  dependency-version: 4.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Package.resolved

@@ -20,7 +20,7 @@ let package = Package(
         ),
         .package(
             url: "https://github.com/govuk-one-login/mobile-ios-networking.git",
-            from: "3.0.0"
+            from: "4.0.0"
         )
     ],
     targets: [