recipes: Update LICENSE variable to use SPDX license identifiers

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-devtools/python/python3-apt_2.3.0.bb

@@ -1,5 +1,5 @@
 SUMMARY = "Python-apt is a wrapper to use features of apt from python."
-LICENSE = "GPLv2 & FSFAP"
+LICENSE = "GPL-2.0-only & FSFAP"
 LIC_FILES_CHKSUM = "file://COPYING.GPL;md5=0636e73ff0215e8d672dc4c32c317bb3 \
                     file://debian/copyright;md5=4ed7b6862ca422678b17e7d4ed592285"
 

meta-oe/recipes-devtools/python/python3-distutils-extra_2.39.bb

@@ -2,7 +2,7 @@ SUMMARY = "python-distutils extension"
 DESCRIPTION = "python-distutils extension integrating gettext support, themed icons and scrollkeeper based documentation"
 HOMEPAGE = "https://launchpad.net/python-distutils-extra"
 SECTION = "devel/python"
-LICENSE = "GPLv2"
+LICENSE = "GPL-2.0-only"
 LIC_FILES_CHKSUM = "file://LICENSE;md5=4325afd396febcb659c36b49533135d4"
 
 SRC_URI = "https://launchpad.net/python-distutils-extra/trunk/${PV}/+download/python-distutils-extra-${PV}.tar.gz"

meta-oe/recipes-devtools/python/python3-pycups_2.0.1.bb

@@ -9,7 +9,7 @@
 
 DESCRIPTION = "pycups - CUPS bindings for Python"
 HOMEPAGE = "https://github.com/OpenPrinting/pycups"
-LICENSE = "GPLv2+"
+LICENSE = "GPL-2.0-or-later"
 LIC_FILES_CHKSUM = "file://COPYING;md5=b234ee4d69f5fce4486a80fdaf4a4263"
 DEPENDS += "cups"