fix: remove unused dependency swagger-parser

[zastrowm]

Description

Having the dependency breaks uv installs as swagger-parser depends on pre-release library which is not allowed by default

As far as I can tell, this dependency is not used anywhere and can be safely removed

Details

Before these changes:

 uv sync --extra dev
  × No solution found when resolving dependencies:
  ╰─▶ Because there is no version of pyyaml==5.2b1 and swagger-parser==1.0.2 depends on pyyaml==5.2b1, we can conclude that swagger-parser==1.0.2 cannot be used.
      And because only swagger-parser<=1.0.2 is available, we can conclude that swagger-parser>=1.0.2 cannot be used.
      And because strands-agents[dev] depends on swagger-parser>=1.0.2 and your project requires strands-agents[dev], we can conclude that your project's requirements are unsatisfiable.

      hint: `pyyaml` was requested with a pre-release marker (e.g., pyyaml==5.2b1), but pre-releases weren't enabled (try: `--prerelease=allow`)

After these changes:

uv sync --extra dev
Resolved 147 packages in 957ms
      Built strands-agents @ file:///Users/zastrowm/workspace/strands/sdk-python
Prepared 16 packages in 10.75s
Installed 99 packages in 226ms
 + annotated-types==0.7.0
 + anyio==4.9.0
 + argcomplete==3.6.2
...

Related Issues

N/A

Documentation PR

N/A

Type of Change

Bug fix

Testing

• hatch fmt --linter
• hatch fmt --formatter
• hatch test --all
• Verify that the changes do not break functionality or introduce warnings in consuming repositories: agents-docs, agents-tools, agents-cli

Checklist

• I have read the CONTRIBUTING document
• I have added tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature
• My changes generate no new warnings
• Any dependent changes have been merged and published

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[Unshure]

Looks like this may have been included by accident as part of some OpenAPI -> Tool feature at some point. Makes sense to remvoe