chore(deps): update base64-url requirement from 2.0.0 to 3.0.0 (#88)

Updates the requirements on [base64-url](https://github.com/magiclen/base64-url) to permit the latest version.
- [Commits](magiclen/base64-url@v2.0.0...v3.0.0)

---
updated-dependencies:
- dependency-name: base64-url
  dependency-type: direct:production
...

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

Author: dependabot[bot]

fastly-edge-assignments/Cargo.toml

@@ -7,7 +7,7 @@ edition = "2021"
 publish = false
 
 [dependencies]
-base64-url = "2.0.0"
+base64-url = "3.0.0"
 chrono = "0.4.19"
 eppo_core = { version = "=4.1.1", path = "../eppo_core" }
 fastly = "0.11.0"