Upgrade rust/crates/futures-channel to 0.3.13

Test: make
Change-Id: I8bd03bbf349f15794918288e1bbfbd41c43215f5
diff --git a/Cargo.toml b/Cargo.toml
index 494deb5..30ee771 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,7 @@
 [package]
 edition = "2018"
 name = "futures-channel"
-version = "0.3.12"
+version = "0.3.13"
 authors = ["Alex Crichton <alex@alexcrichton.com>"]
 description = "Channels for asynchronous communication using futures-rs.\n"
 homepage = "https://rust-lang.github.io/futures-rs"
@@ -24,11 +24,11 @@
 all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
 [dependencies.futures-core]
-version = "0.3.12"
+version = "0.3.13"
 default-features = false
 
 [dependencies.futures-sink]
-version = "0.3.12"
+version = "0.3.13"
 optional = true
 default-features = false