[BUG] Needed dependencies not listed in toml file by default

[athermantis]

Describe the bug
When using the "pip install bedrock-agentcore-starter-toolkit" and "agentcore create" command, needed dependencies (like boto3 and botocore) are not included, even when specificizing strands and bedrock as the configuration.

To Reproduce
Steps to reproduce the behavior:

1. start with blank project and blank pyenv
2. Run pip install bedrock-agentcore-starter-toolkit
3. Run agentcore create
4. Run agentcore --dev
5. Run agentcore invoke --dev "test"
   Expected behavior
   Starter kit has installed necessary dependencies to get project to run

Error Output
Missing botocore and boto3 dependencies. These should be included in the toml file by default.

Environment:

• Replicated on Windows 11 and WSL unbuntu. Likely more problematic for first time devs in agentcore and those not familiar with python

Additional context
Add any other context about the problem here.