docs: require Rust 1.57.0

Signed-off-by: Miguel Ojeda <[email protected]>

Author: ojeda

Documentation/process/changes.rst

@@ -36,7 +36,7 @@ know what you are doing, use the exact version listed here. Please see
 ====================== ===============  ========================================
 GNU C                  5.1              gcc --version
 Clang/LLVM (optional)  10.0.1           clang --version
-rustc (optional)       1.56.0           rustc --version
+rustc (optional)       1.57.0           rustc --version
 bindgen (optional)     0.56.0           bindgen --version
 GNU make               3.81             make --version
 binutils               2.23             ld -v

Documentation/rust/quick-start.rst

@@ -26,7 +26,7 @@ Rust features.
 If ``rustup`` is being used, enter the checked out source code directory
 and run::
 
-	rustup override set 1.56.0
+	rustup override set 1.57.0
 
 Otherwise, fetch a standalone installer or install ``rustup`` from: