async deps: add pin-project

Cargo.lock

@@ -352,6 +352,7 @@ dependencies = [
  "futures-util",
  "insta",
  "memmap",
+ "pin-project",
  "serde",
  "serde_derive",
  "serde_json",

lib/Cargo.toml

@@ -20,6 +20,7 @@ async = [
     "tokio",
     "async-compression",
     "async-stream",
+    "pin-project",
 ]
 source = ["zip"]
 source_async = [
@@ -68,6 +69,7 @@ async-compression = { git = "https://github.com/Nullus157/async-compression", re
 async-stream = { version = "0.3", optional = true }
 zstd = { version = "^0.12", default-features = false, optional = true }
 memmap = { version = "0.7.0", optional = true }
+pin-project = { version = "1.1.3", optional = true }
 
 [dev-dependencies]
 insta = { version = "1.31.0", features = ["yaml"] }