Drop python 3.7 (and 2.7) for recipes under dev-python/

Recipes with only 3.7 are left alone. Help with #8025.

dev-python/mutagen/mutagen-1.45.1.recipe

@@ -9,7 +9,7 @@ Ogg streams on an individual packet/page level."
 HOMEPAGE="https://github.com/quodlibet/mutagen"
 COPYRIGHT="Joe Wreschnig, Michael Urman, Lukáš Lalinský, Christoph Reiter, Ben Ockmore & others"
 LICENSE="GNU GPL v2"
-REVISION="2"
+REVISION="3"
 SOURCE_URI="https://files.pythonhosted.org/packages/source/m/$portName/$portName-$portVersion.tar.gz"
 CHECKSUM_SHA256="6397602efb3c2d7baebd2166ed85731ae1c1d475abca22090b7141ff5034b3e1"
 SOURCE_DIR="mutagen-$portVersion"
@@ -27,8 +27,8 @@ BUILD_REQUIRES="
 	haiku_devel
 	"
 
-PYTHON_PACKAGES=(python3 python38 python39)
-PYTHON_VERSIONS=(3.7 3.8 3.9)
+PYTHON_PACKAGES=(python38 python39)
+PYTHON_VERSIONS=(3.8 3.9)
 for i in "${!PYTHON_PACKAGES[@]}"; do
 pythonPackage=${PYTHON_PACKAGES[i]}
 pythonVersion=${PYTHON_VERSIONS[$i]}
@@ -45,7 +45,7 @@ BUILD_PREREQUIRES="$BUILD_PREREQUIRES
 	cmd:python$pythonVersion"
 done
 
-PROVIDES_python3="$PROVIDES_python3
+PROVIDES_python39="$PROVIDES_python39
 	cmd:mid3cp
 	cmd:mid3iconv
 	cmd:mid3v2
@@ -69,7 +69,7 @@ INSTALL()
 			--root=/ --prefix=$prefix \
 			--install-data=$dataDir
 
-		if [ $pythonPackage == python3 ]; then
+		if [ $pythonPackage == python39 ]; then
 			packageEntries $pythonPackage \
 				$prefix/lib/python* \
 				$binDir