[CHORE] default to rustls in chroma client (#5651)

## Description of changes

Cannot build the wheels on linux without openssl.  Switch the default to
something that doesn't bring back linker trauma.

## Test plan

CI

## Migration plan

N/A

## Observability plan

N/A

## Documentation Changes

N/A

Author: rescrv

rust/chroma/Cargo.toml

@@ -21,7 +21,7 @@ chroma-api-types = { workspace = true }
 chroma-types = { workspace = true }
 
 [features]
-default = ["native-tls"]
+default = ["rustls"]
 native-tls = ["reqwest/default-tls", "reqwest/default"]
 rustls = ["reqwest/rustls-tls"]