Begin transition to Python 3.12, new macOS signing

GNUmakefile

@@ -38,12 +38,12 @@ CXFREEZE_EXT	?= win-$(CXFREEZE_ARCH)-$(CXFREEZE_VER)
 SIGNTOOL	?= "c:\Program Files (x86)\Windows Kits\10\bin\10.0.19041.0\x86\signtool.exe"
 
 
-# PY[3] is the target Python interpreter; require 3.9+.  Detect if it is named python3 or python.
+# PY[3] is the target Python interpreter; require 3.11+.  Detect if it is named python3 or python.
 PY3		?= $(shell python3 --version >/dev/null 2>&1 && echo python3 || echo python )
 VERSION		= $(shell $(PY3) -c 'exec(open("slip39/version.py").read()); print( __version__ )')
 PLATFORM	?= $(shell $(PY3) -c "import sys; print( sys.platform )" )
 ifeq ($(PLATFORM),darwin)
-	INSTALLER	:= dmg
+	INSTALLER	:= pkg
 else ifeq ($(PLATFORM),win32)
 	INSTALLER	:= msi
 else
@@ -303,7 +303,7 @@ dist/slip39-$(VERSION)-win64.msi: build/exe.$(CXFREEZE_EXT)/SLIP-39.exe # signin
 # 
 dist/SLIP-39-$(VERSION).dmg:	dist/SLIP-39.app
 	@echo -e "\n\n*** Creating and signing DMG $@..."
-	npx create-dmg --overwrite $<
+	npx create-dmg -v --overwrite --identity "$(PKGID)" $< dist/
 	mv "SLIP-39 $(VERSION).dmg" "$@"
 	@echo "Checking signature..."; ./SLIP-39.metadata/check-signature $@