rust: set minimum rust version to 1.85

1.85 was chosen for now as it supports edition 2024. However, we have
not set our edition to 2024 yet.

configure.ac

@@ -2097,7 +2097,7 @@ fi
     cargo_version_output=$($CARGO --version)
     cargo_version=$(echo "$cargo_version_output" | sed 's/^.*[[^0-9]]\([[0-9]]*\.[[0-9]]*\.[[0-9]]*\).*$/\1/')
 
-    MIN_RUSTC_VERSION="1.75.0" # MSRV
+    MIN_RUSTC_VERSION="1.85.0" # MSRV
     AC_MSG_CHECKING(for Rust version $MIN_RUSTC_VERSION or newer)
     AS_VERSION_COMPARE([$rustc_version], [$MIN_RUSTC_VERSION],
         [

rust/Cargo.toml.in

@@ -4,7 +4,7 @@ version = "@PACKAGE_VERSION@"
 license = "GPL-2.0-only"
 description = "Suricata Rust components"
 edition = "2021"
-rust-version = "1.75.0"
+rust-version = "1.85.0"
 
 [workspace]
 members = [