chore: bump minimum required rust version in installs

install.ps1

@@ -53,7 +53,7 @@ function vercomp($v1, $v2) {
 }
 
 $rustVersion = $(rustc --version).Split(" ")[1]
-$minRustVersion = "1.39"
+$minRustVersion = "1.56"
 if ((vercomp $rustVersion $minRustVersion) -eq 2) {
     Write-Host "WARNING: Rust version is too old: $rustVersion - needs at least $minRustVersion"
     Write-Host "Please update Rust with 'rustup update'"

install.sh

@@ -100,7 +100,7 @@ function vercomp() {
 }
 
 RustVersion=$(rustc --version | cut -d " " -f 2)
-MinRustVersion=1.39
+MinRustVersion=1.56
 vercomp "$RustVersion" $MinRustVersion || ec=$?
 if [ ${ec:-0} -eq 2 ]
 then