bump the Minimum Supported Rust Version to 1.59.0

Needed for os_str_bytes & time:

```
error: package `os_str_bytes v6.3.0` cannot be built because it requires rustc 1.57.0 or newer, while the currently active rustc version is 1.56.1
error: package `time v0.3.14` cannot be built because it requires rustc 1.59.0 or newer, while the currently active rustc version is 1.56.1
```

.clippy.toml

@@ -1 +1 @@
-msrv = "1.56.1"
+msrv = "1.59.0"

.github/workflows/CICD.yml

@@ -13,7 +13,7 @@ env:
   PROJECT_NAME: coreutils
   PROJECT_DESC: "Core universal (cross-platform) utilities"
   PROJECT_AUTH: "uutils"
-  RUST_MIN_SRV: "1.56.1" ## MSRV v1.56.1
+  RUST_MIN_SRV: "1.59.0" ## MSRV v1.59.0
   # * style job configuration
   STYLE_FAIL_ON_FAULT: true ## (bool) fail the build if a style job contains a fault (error or warning); may be overridden on a per-job basis
 

README.md

@@ -7,7 +7,7 @@
 [![dependency status](https://deps.rs/repo/github/uutils/coreutils/status.svg)](https://deps.rs/repo/github/uutils/coreutils)
 
 [![CodeCov](https://codecov.io/gh/uutils/coreutils/branch/master/graph/badge.svg)](https://codecov.io/gh/uutils/coreutils)
-![MSRV](https://img.shields.io/badge/MSRV-1.56.1-brightgreen)
+![MSRV](https://img.shields.io/badge/MSRV-1.59.0-brightgreen)
 
 -----------------------------------------------
 
@@ -52,7 +52,7 @@ Both can also be generated locally, the instructions for that can be found in th
 ### Rust Version
 
 uutils follows Rust's release channels and is tested against stable, beta and nightly.
-The current Minimum Supported Rust Version (MSRV) is `1.56.1`.
+The current Minimum Supported Rust Version (MSRV) is `1.59.0`.
 
 ## Building