Vendor dependencies

Let's see how I like this workflow.

vendor/bumpalo/Cargo.toml

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+# 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 = "2021"
+name = "bumpalo"
+version = "3.11.1"
+authors = ["Nick Fitzgerald <fitzgen@gmail.com>"]
+exclude = [
+    "/.github/*",
+    "/benches",
+    "/tests",
+    "valgrind.supp",
+    "bumpalo.png",
+]
+description = "A fast bump allocation arena for Rust."
+documentation = "https://docs.rs/bumpalo"
+readme = "README.md"
+categories = [
+    "memory-management",
+    "rust-patterns",
+    "no-std",
+]
+license = "MIT/Apache-2.0"
+repository = "https://github.com/fitzgen/bumpalo"
+resolver = "2"
+
+[package.metadata.docs.rs]
+all-features = true
+
+[lib]
+path = "src/lib.rs"
+bench = false
+
+[[test]]
+name = "try_alloc"
+path = "tests/try_alloc.rs"
+harness = false
+
+[[bench]]
+name = "benches"
+path = "benches/benches.rs"
+harness = false
+required-features = ["collections"]
+
+[dev-dependencies.criterion]
+version = "0.3.6"
+
+[dev-dependencies.quickcheck]
+version = "1.0.3"
+
+[dev-dependencies.rand]
+version = "0.8.5"
+
+[features]
+allocator_api = []
+boxed = []
+collections = []
+default = []