Update eth-abi requirement from <3,>=2.1.1 to >=2.1.1,<6

Updates the requirements on [eth-abi](https://github.com/ethereum/eth-abi) to permit the latest version.
- [Release notes](https://github.com/ethereum/eth-abi/releases)
- [Changelog](https://github.com/ethereum/eth-abi/blob/main/docs/release_notes.rst)
- [Commits](ethereum/eth-abi@v2.1.1...v5.1.0)

---
updated-dependencies:
- dependency-name: eth-abi
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

setup.py

@@ -54,7 +54,7 @@ def run(self):
     install_requires=[
         "pretix>=3.8.0",
         "web3>=5.7.0",
-        "eth-abi>=2.1.1,<3",
+        "eth-abi>=2.1.1,<6",
         "eth-typing>=2.2.1,<3",
         "eth-utils>=1.8.4,<2",
         "eth-hash[pycryptodome]>=0.3.1,<0.4",