fix: Remove unused futures dependency from geneva-uploader main deps (#426)

Author: gscalderon

opentelemetry-exporter-geneva/geneva-uploader/Cargo.toml

@@ -20,7 +20,6 @@ url = "2.2"
 md5 = "0.8.0"
 hex = "0.4"
 lz4_flex = { version = "0.11", features = ["safe-encode"], default-features = false }
-futures = "0.3"
 
 [features]
 self_signed_certs = [] # Empty by default for security