build(deps): bump futures from 0.3.9 to 0.3.12

Bumps [futures](https://github.com/rust-lang/futures-rs) from 0.3.9 to 0.3.12.
- [Release notes](https://github.com/rust-lang/futures-rs/releases)
- [Changelog](https://github.com/rust-lang/futures-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/futures-rs/compare/0.3.9...0.3.12)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Cargo.lock

@@ -402,9 +402,9 @@ checksum = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
 
 [[package]]
 name = "futures"
-version = "0.3.9"
+version = "0.3.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c70be434c505aee38639abccb918163b63158a4b4bb791b45b7023044bdc3c9c"
+checksum = "da9052a1a50244d8d5aa9bf55cbc2fb6f357c86cc52e46c62ed390a7180cf150"
 dependencies = [
  "futures-channel",
  "futures-core",
@@ -417,9 +417,9 @@ dependencies = [
 
 [[package]]
 name = "futures-channel"
-version = "0.3.11"
+version = "0.3.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "31ebc390c6913de330e418add60e1a7e5af4cb5ec600d19111b339cafcdcc027"
+checksum = "f2d31b7ec7efab6eefc7c57233bb10b847986139d88cc2f5a02a1ae6871a1846"
 dependencies = [
  "futures-core",
  "futures-sink",
@@ -433,9 +433,9 @@ checksum = "79e5145dde8da7d1b3892dad07a9c98fc04bc39892b1ecc9692cf53e2b780a65"
 
 [[package]]
 name = "futures-executor"
-version = "0.3.9"
+version = "0.3.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9ee9ca2f7eb4475772cf39dd1cd06208dce2670ad38f4d9c7262b3e15f127068"
+checksum = "e9e59fdc009a4b3096bf94f740a0f2424c082521f20a9b08c5c07c48d90fd9b9"
 dependencies = [
  "futures-core",
  "futures-task",
@@ -450,9 +450,9 @@ checksum = "28be053525281ad8259d47e4de5de657b25e7bac113458555bb4b70bc6870500"
 
 [[package]]
 name = "futures-macro"
-version = "0.3.11"
+version = "0.3.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "95778720c3ee3c179cd0d8fd5a0f9b40aa7d745c080f86a8f8bed33c4fd89758"
+checksum = "c287d25add322d9f9abdcdc5927ca398917996600182178774032e9f8258fedd"
 dependencies = [
  "proc-macro-hack",
  "proc-macro2",
@@ -477,9 +477,9 @@ dependencies = [
 
 [[package]]
 name = "futures-util"
-version = "0.3.11"
+version = "0.3.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cad5e82786df758d407932aded1235e24d8e2eb438b6adafd37930c2462fb5d1"
+checksum = "632a8cd0f2a4b3fdea1657f08bde063848c3bd00f9bbf6e256b8be78802e624b"
 dependencies = [
  "futures-channel",
  "futures-core",