🐛 Fix #236: stop forwarding backoff_jitter to requests

[YashGaykar0309]

Description

• Fixes compatibility with urllib3 1.26.x, which is required by some boto3/botocore versions.
• Retry options (max_retries, backoff_factor, backoff_jitter, and backoff_max) are now handled entirely by the SDK retry logic and are no longer forwarded to requests, preventing unexpected keyword argument errors.
• Custom retry settings are preserved across retry attempts by restoring them when creating subsequent Retry instances.
• The minimum urllib3 requirement is relaxed from >=2.6.3 to >=1.26.0.

Fixes: #236

Please check the relevant option(s):

• 🐛 Bug fix
• ✨ New feature
• 🧹 Code cleanup or refactor
• 📝 Documentation update
• 🔧 Build or CI-related change
• 🔒 Security fix
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How Has This Been Tested?

Please describe the test strategy:

• Manual testing
• Unit tests
• Integration tests
• Not tested yet

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my-cli-tool build --verbose
my-cli-tool test

Checklist

• I have followed the Contributing Guidelines
• I have added tests or explained why they are not needed
• I have updated relevant documentation (README, examples, etc.)
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