cgroups: upgrade cgroupfs to 0.3.1

Trait method cause for std::error::Error is deprecated thus need replace
it with source method for cgroups-fs::error::ErrorKind.

Fixes: #6192
Signed-off-by: Jianyong Wu <jianyong.wu@arm.com>

src/runtime-rs/Cargo.lock

@@ -401,9 +401,9 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "cgroups-rs"
-version = "0.3.0"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4b97b639839204a6eb727ffbbd68e1dcfc55488c3a26cb0cda1d662b7a186e79"
+checksum = "8d5761f3a351b92e0e02a31ca418190bb323edb0d4fce0109b6dba673dc3fdc1"
 dependencies = [
  "libc",
  "log",

src/runtime-rs/crates/resource/Cargo.toml

@@ -14,7 +14,7 @@ anyhow = "^1.0"
 async-trait = "0.1.48"
 bitflags = "1.2.1"
 byte-unit = "4.0.14"
-cgroups-rs = "0.3.0"
+cgroups-rs = "0.3.1"
 futures = "0.3.11"
 lazy_static = "1.4.0"
 libc = ">=0.2.39"