Upgrade rust/crates/futures-task to 0.3.12

Test: make
Change-Id: I279c5a7c33fad5e996a2249bc5742ff7a8de1a0c
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
index f07ec6f..3a8a67a 100644
--- a/Cargo.toml.orig
+++ b/Cargo.toml.orig
@@ -1,12 +1,12 @@
 [package]
 name = "futures-task"
 edition = "2018"
-version = "0.3.7"
+version = "0.3.12"
 authors = ["Alex Crichton <alex@alexcrichton.com>"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-lang/futures-rs"
 homepage = "https://rust-lang.github.io/futures-rs"
-documentation = "https://docs.rs/futures-task/0.3.7"
+documentation = "https://docs.rs/futures-task/0.3"
 description = """
 Tools for working with tasks.
 """
@@ -25,5 +25,8 @@
 [dependencies]
 once_cell = { version = "1.3.1", default-features = false, features = ["std"], optional = true }
 
+[dev-dependencies]
+futures = { path = "../futures" }
+
 [package.metadata.docs.rs]
 all-features = true