rust: set MSRV to 1.75.0

This is the Rust version found on Ubuntu LTS releases as of today, and
is the oldest we need to support.

Ticket: #6573

.github/workflows/builds.yml

@@ -1348,7 +1348,7 @@ jobs:
                 wget
       # specific version to match up to the llvm version in ubuntu below
       - name: Install Rust
-        run: curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain 1.67.1 -y
+        run: curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain 1.75.0 -y
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
       - run: git config --global --add safe.directory /__w/suricata/suricata
       - uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093
@@ -1453,7 +1453,7 @@ jobs:
                 dpdk-dev
       # specific version to match up to the llvm version in ubuntu below
       - name: Install Rust
-        run: curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain 1.67.1 -y
+        run: curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain 1.75.0 -y
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
       - run: git config --global --add safe.directory /__w/suricata/suricata
       - uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093
@@ -1776,7 +1776,7 @@ jobs:
                 dpdk-dev
       # packaged Rust version is too old for coverage, so get from rustup
       - name: Install Rust
-        run: curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain 1.67.1 -y
+        run: curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain 1.75.0 -y
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
       - run: git config --global --add safe.directory /__w/suricata/suricata
       - uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093

configure.ac

@@ -2069,7 +2069,7 @@ 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="1.67.1" # MSRV
+    MIN_RUSTC_VERSION="1.75.0" # 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 = "1.67.1"
+rust-version = "1.75.0"
 
 [workspace]
 members = [