gtk_doc: switch to python 3.9

dev-util/gtk_doc/gtk_doc-1.33.2.recipe

@@ -6,7 +6,7 @@ be used to document application code."
 HOMEPAGE="https://www.gtk.org/gtk-doc/"
 COPYRIGHT="2002-2018 Damon Chaplin and Owen Taylor"
 LICENSE="GNU GPL v2"
-REVISION="2"
+REVISION="3"
 SOURCE_URI="https://download.gnome.org/sources/gtk-doc/${portVersion%.*}/gtk-doc-$portVersion.tar.xz"
 CHECKSUM_SHA256="cc1b709a20eb030a278a1f9842a362e00402b7f834ae1df4c1998a723152bf43"
 SOURCE_DIR="gtk-doc-$portVersion"
@@ -30,11 +30,11 @@ PROVIDES="
 	"
 REQUIRES="
 	haiku
-	pygments_python3
-	six_python3
+	pygments_python39
+	six_python39
 	cmd:perl
 	cmd:pkg_config
-	cmd:python3
+	cmd:python3.9
 	cmd:xsltproc
 	devel:libglib_2.0
 	docbook_xsl_stylesheets
@@ -45,7 +45,7 @@ BUILD_REQUIRES="
 	devel:libglib_2.0
 	docbook_xml_dtd
 	docbook_xsl_stylesheets
-	pygments_python3
+	pygments_python39
 	"
 BUILD_PREREQUIRES="
 	cmd:awk
@@ -61,9 +61,9 @@ BUILD_PREREQUIRES="
 	"
 
 TEST_REQUIRES="
-	lxml_python3
-	parameterized_python3
-	six_python3
+	lxml_python39
+	parameterized_python39
+	six_python39
 	devel:libglib_2.0
 	cmd:bc
 	cmd:xmllint