chore(deps): update dependency singer-sdk to v0.53.5

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
singer-sdk (changelog)	0.53.4 → 0.53.5

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Release Notes

meltano/sdk (singer-sdk)

v0.53.5

Compare Source

🐛 Fixes

• #​3436 Do not try to parse the error response from the OAuth token request as JSON to avoid deserialization errors
• #​3432 Add details to the variant prompt in templates
• #​3426 Update template dependencies
• #​3412 Add concurrency config to CI workflows in templates
• #​3411 Simplify Python version handling in templates

📚 Documentation Improvements

• #​3417 Bump the furo theme to 2025.12.19

📦 Packaging changes

• #​3405 Bump build requirement hatchling to 1.28.0

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