feat(shuttle-axum): support axum 0.8, drop axum 0.6

[jonaro00]

feature flag for using 0.7

tested by compiling axum/hello-world with both 0.7 and 0.8

[greptile-apps]

PR Summary

This PR adds support for Axum 0.8 while maintaining compatibility with versions 0.7 and 0.6 in the shuttle-axum service integration.

• Updated axum dependency in services/shuttle-axum/Cargo.toml to support versions >=0.7.3, <0.9.0
• Modified services/shuttle-axum/README.md to use version placeholders instead of hardcoded version numbers
• Simplified tracing functionality in runtime/src/start.rs by using fully qualified paths for logging statements

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[greptile-apps]

PR Summary

(updates since last review)

This PR updates the Axum integration to make version 0.8 the default while providing backward compatibility for 0.7 through feature flags.

• Removed support for Axum 0.6 and updated binding logic in services/shuttle-axum/src/lib.rs to use the new serve function pattern
• Added axum-0-7 feature flag in services/shuttle-axum/Cargo.toml for optional 0.7.3 compatibility
• Updated services/shuttle-axum/README.md to clarify that 0.8 is now the default version with instructions for using 0.7

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[greptile-apps]

PR Summary

(updates since last review)

Updated CI configuration to align with the new Axum version support structure, ensuring proper testing of both 0.8 and 0.7 versions.

• Modified feature flag testing in Makefile.toml to replace axum-0-6 with axum-0-7 in CI tasks
• Updated services/shuttle-axum/Cargo.toml to set Axum 0.8.1 as the default version
• Added explicit version numbers in services/shuttle-axum/README.md for clarity in feature flag usage

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[greptile-apps]

PR Summary

Updated examples submodule to align with the new Axum version support structure.

• Updated examples submodule reference from 7a65de0 to 917a24e to reflect Axum 0.8 compatibility
• Removed axum-0-6 feature flag testing in Makefile.toml but should add explicit testing for Axum 0.8
• Consider adding test coverage for both 0.7 and 0.8 versions in CI pipeline

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[greptile-apps]

PR Summary

(updates since last review)

This PR updates the axum dependency to version 0.8.1 across multiple test resources while maintaining compatibility with version 0.7 through feature flags.

• Updated axum dependency to 0.8.1 in test resources service/tests/resources/*/Cargo.toml
• Potential compatibility issue with tokio 1.22.0 in workspace test resources which may be too old for axum 0.8.1
• Consider updating shuttle-axum dependency paths in workspace test resources to use version constraints

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