ci/cd: move Fedora to 43 and speed up its dnf installs

Fedora 41 is EOL, so its mirrors moved to the slow archive: the first
dnf transaction took ~7 minutes in the last CD run. Use the current
fedora:43 image (all dependency names verified against F41 and F43) and
skip weak dependencies / download in parallel in both dnf calls.

.github/workflows/cd.yml

@@ -10,7 +10,7 @@ permissions:
   contents: write
 
 # One matrix, seven platforms, the same environments CI tests in (see
-# .github/workflows/ci.yml): Debian 12 / Fedora 41 / Arch / openKylin x64
+# .github/workflows/ci.yml): Debian 12 / Fedora 43 / Arch / openKylin x64
 # and arm64 containers plus the macOS and Windows hosts. Every package is
 # built from scratch — no vcpkg/cargo caches: a restored vcpkg_installed
 # or target tree has masked packaging problems before (stale ports,
@@ -44,7 +44,7 @@ jobs:
             runner: warp-ubuntu-latest-x64-32x
             triplet: x64-linux
             artifact: linux-fedora
-            container: '{"image":"fedora:41","options":"--shm-size=8g"}'
+            container: '{"image":"fedora:43","options":"--shm-size=8g"}'
           - name: Arch
             platform: linux
             distro: arch
@@ -95,7 +95,7 @@ jobs:
         shell: bash
         run: |
           case "${{ matrix.distro }}" in
-            fedora) dnf install -y git curl wget which ;;
+            fedora) dnf install -y --setopt=install_weak_deps=False --setopt=max_parallel_downloads=16 git curl wget which ;;
             arch) pacman -Sy --noconfirm git curl wget which ;;
             debian|openkylin) apt-get update && apt-get install -y git curl ca-certificates wget ;;
           esac
@@ -184,7 +184,11 @@ jobs:
         if: matrix.distro == 'fedora'
         shell: bash
         run: |
-          dnf install -y \
+          # Fedora 41 is EOL (its mirrors moved to the slow archive), so
+          # the matrix uses the current release; weak dependencies (docs,
+          # fonts, optional tooling) are skipped and downloads run wide.
+          dnf install -y --setopt=install_weak_deps=False \
+            --setopt=max_parallel_downloads=16 \
             gcc gcc-c++ clang clang-devel cmake pkgconf-pkg-config nasm \
             git curl zip unzip tar python3 patch xz which \
             pipewire-devel jack-audio-connection-kit-devel \