ci: fix otptool.py path in release workflow

This script has changed names.

Signed-off-by: James Wainwright <james.wainwright@lowrisc.org>

Author: jwnrt

scripts/opentitan/make_release.sh

@@ -18,4 +18,4 @@ QEMU_BUILD="$3"
 tar --create --auto-compress --verbose --file="$OUT_TARBALL" \
     --directory="$QEMU_DIR" \
     "$QEMU_BUILD"/qemu-{system-riscv32,img} \
-    scripts/opentitan/{otpconv,flashgen}.py
+    scripts/opentitan/{otptool,flashgen}.py