fix: include caller module name in use Tesla deprecation warning

[mehiel]

The deprecation warning for use Tesla / use Tesla.Builder now includes the name of the module invoking the macro, making it easier to locate and migrate deprecated usages in large codebases.

[cursor]

PR Summary

Low Risk
Low risk: changes only the deprecation warning text by interpolating __CALLER__.module, with no effect on runtime request behavior.

Overview
Improves the deprecation warning emitted by Tesla.Builder.__using__/1 to include the calling module name (via __CALLER__.module), making deprecated use Tesla/use Tesla.Builder usages easier to locate in larger codebases.

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[Copilot]

Pull request overview

Updates Tesla’s use Tesla / use Tesla.Builder deprecation warning to include the caller module name, making deprecated macro usages easier to locate during compilation.

Changes:

• Capture the invoking module via __CALLER__.module inside Tesla.Builder.__using__/1.
• Include the caller module name in the emitted IO.warn/1 deprecation message.

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