Arguments do not build correctly when using a dict

[elliotgunton]

Pre-bug-report checklist

1. This bug can be reproduced using pure Argo YAML

• Yes 👉 Please report a bug to the Argo Workflows GitHub 👈
• No

If yes, it is more likely to be an Argo bug unrelated to Hera. Please double check before submitting an issue to Hera.

2. This bug occurs in Hera when...

• exporting to YAML
• submitting to Argo
• running on Argo with the Hera runner
• other:

Bug report

Describe the bug
A clear and concise description of what the bug is:

TODO - basically using w.arguments = {"param_name": "value"} before doing w.create() doesn't get the argument correctly because we don't check if self.arguments is itself a dict here

hera/src/hera/workflows/_mixins.py

Line 562 in 523a9b9

for arg in self.arguments:

Error log if applicable:

error: something broke!

To Reproduce
Full Hera code to reproduce the bug:

from hera.workflows import Workflow

with Workflow(name="my-workflow") as w:
    # Add your code here

Expected behavior
A clear and concise description of what you expected to happen:

Environment

• Hera Version: 5.X.X
• Python Version: 3.X.X
• Argo Version: 3.X.X

Additional context
Add any other context about the problem here.