* fix(vertex_ai): Fixes issue where multimodal message without text was failing vertex calls
Fixes https://github.com/BerriAI/litellm/issues/5515
* fix(azure.py): move to using httphandler for oidc token calls
Fixes issue where ssl certificates weren't being picked up as expected
Closes https://github.com/BerriAI/litellm/issues/5522
* feat: Allows admin to set a default_max_internal_user_budget in config, and allow setting more specific values as env vars
* fix(proxy_server.py): fix read for max_internal_user_budget
* build(model_prices_and_context_window.json): add regional gpt-4o-2024-08-06 pricing
Closes https://github.com/BerriAI/litellm/issues/5540
* test: skip re-test
```shell
$ poetry run flake8 litellm/tests/test_prompt_factory.py
<unknown>:215: SyntaxWarning: invalid escape sequence '\/'
litellm/tests/test_prompt_factory.py:215:21: W605 invalid escape sequence '\/'
```
Fixed by making the string a raw string, which is equivalent:
```
$ python
Python 3.11.6 (main, Oct 25 2023, 19:49:20) [Clang 14.0.0 (clang-1400.0.29.202)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> "data:image\/jpeg;base64,1234" == r"data:image\/jpeg;base64,1234"
True
```
See: https://stackoverflow.com/questions/52335970/how-to-fix-syntaxwarning-invalid-escape-sequence-in-python
