textproc/py-nltk: update to 3.8.1

Update to latest version, convert to pep517

Changelog:
https://www.nltk.org/news.html#id1

textproc/py-nltk/Makefile

 PORTNAME=	nltk
-DISTVERSION=	3.7
+DISTVERSION=	3.8.1
 PORTEPOCH=	2
 CATEGORIES=	textproc education python
 MASTER_SITES=	PYPI
@@ -11,6 +11,8 @@ WWW=		https://www.nltk.org/
 
 LICENSE=	APACHE20
 
+BUILD_DEPENDS=	${PY_SETUPTOOLS} \
+		${PYTHON_PKGNAMEPREFIX}wheel>0:devel/py-wheel@${PY_FLAVOR}
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}click>0:devel/py-click@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}joblib>0:devel/py-joblib@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}regex>0:textproc/py-regex@${PY_FLAVOR} \
@@ -19,7 +21,7 @@ RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}click>0:devel/py-click@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}sqlite3>0:databases/py-sqlite3@${PY_FLAVOR}
 
 USES=		cpe python zip
-USE_PYTHON=	distutils autoplist
+USE_PYTHON=	pep517 autoplist
 
 NO_ARCH=	yes
 

textproc/py-nltk/distinfo

-TIMESTAMP = 1666689261
-SHA256 (nltk-3.7.zip) = d6507d6460cec76d70afea4242a226a7542f85c669177b9c7f562b7cf1b05502
-SIZE (nltk-3.7.zip) = 3293449
+TIMESTAMP = 1693218247
+SHA256 (nltk-3.8.1.zip) = 1834da3d0682cba4f2cede2f9aad6b0fafb6461ba451db0efb6f9c39798d64d3
+SIZE (nltk-3.8.1.zip) = 4620388