chore: checkpoint before Python removal

vendor/tower-service/Cargo.toml

@@ -0,0 +1,55 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2018"
+name = "tower-service"
+version = "0.3.3"
+authors = ["Tower Maintainers <team@tower-rs.com>"]
+build = false
+autobins = false
+autoexamples = false
+autotests = false
+autobenches = false
+description = """
+Trait representing an asynchronous, request / response based, client or server.
+"""
+homepage = "https://github.com/tower-rs/tower"
+documentation = "https://docs.rs/tower-service/0.3.3"
+readme = "README.md"
+categories = [
+    "asynchronous",
+    "network-programming",
+]
+license = "MIT"
+repository = "https://github.com/tower-rs/tower"
+
+[lib]
+name = "tower_service"
+path = "src/lib.rs"
+
+[dependencies]
+
+[dev-dependencies.futures]
+version = "0.3.22"
+
+[dev-dependencies.http]
+version = "0.2"
+
+[dev-dependencies.tokio]
+version = "1.6.2"
+features = [
+    "macros",
+    "time",
+]
+
+[dev-dependencies.tower-layer]
+version = "0.3"