v3.31.1: the Linux PC/SC headers (pyscard builds from source)

The first release run failed installing the test dependencies:
pyscard 2.3.1 publishes macOS and Windows wheels only (no manylinux),
so on Linux it always builds from source and needs the PC/SC headers -
the job stopped at "winscard.h: No such file or directory".

- The release workflow installs libpcsclite-dev before the dependencies.
- The READMEs and setup.sh name the header package next to pcscd/ccid:
  libpcsclite-dev (Debian/Ubuntu), pcsc-lite-devel (Fedora), included
  in Arch's pcsclite.  This affects every Linux user running setup, not
  just CI.
- Version strings + the PWA cache bumped together (simple-v456).

No runtime change: 997 Python + 953 frontend green; the release package
test builds with the new version.

setup.sh

@@ -45,10 +45,11 @@ if command -v pcscd >/dev/null 2>&1; then
     fi
 else
     echo "Note: PC/SC daemon not found. If you use a USB smart card reader,"
-    echo "install pcsc-lite and ccid:"
-    echo "  Debian/Ubuntu: sudo apt install pcscd pcsc-tools"
-    echo "  Arch Linux:    sudo pacman -S pcsc-lite ccid"
-    echo "  Fedora:        sudo dnf install pcsc-lite pcsc-lite-ccid"
+    echo "install pcsc-lite and ccid (plus the PC/SC headers that the"
+    echo "pyscard build needs on Linux):"
+    echo "  Debian/Ubuntu: sudo apt install pcscd pcsc-tools libpcsclite-dev"
+    echo "  Arch Linux:    sudo pacman -S pcsc-lite ccid   (headers included)"
+    echo "  Fedora:        sudo dnf install pcsc-lite pcsc-lite-ccid pcsc-lite-devel"
 fi
 
 echo ""