Upgrade SpeziFoundation (#113)

# Upgrade SpeziFoundation

## ♻️ Current situation & Problem
Small PR that bumps SpeziFoundation version to 2.0.0-beta.1


## ⚙️ Release Notes 
* Upgrade to SpeziFoundation 2.0.0-beta.1


## 📚 Documentation
--


## ✅ Testing
--

## 📝 Code of Conduct & Contributing Guidelines 

By submitting creating this pull request, you agree to follow our [Code
of
Conduct](https://github.com/StanfordSpezi/.github/blob/main/CODE_OF_CONDUCT.md)
and [Contributing
Guidelines](https://github.com/StanfordSpezi/.github/blob/main/CONTRIBUTING.md):
- [x] I agree to follow the [Code of
Conduct](https://github.com/StanfordSpezi/.github/blob/main/CODE_OF_CONDUCT.md)
and [Contributing
Guidelines](https://github.com/StanfordSpezi/.github/blob/main/CONTRIBUTING.md).

Package.swift

@@ -33,7 +33,7 @@ let package = Package(
         .library(name: "XCTSpezi", targets: ["XCTSpezi"])
     ],
     dependencies: [
-        .package(url: "https://github.com/StanfordSpezi/SpeziFoundation", from: "1.0.2"),
+        .package(url: "https://github.com/StanfordSpezi/SpeziFoundation", from: "2.0.0-beta.1"),
         .package(url: "https://github.com/StanfordBDHG/XCTRuntimeAssertions", from: "1.1.1"),
         .package(url: "https://github.com/apple/swift-collections.git", from: "1.1.1")
     ] + swiftLintPackage(),