Support go1.20

With nexedi/slapos@cdca92ee golang1.20 was
added to SlapOS and with nexedi/slapos@bea93ff2 it
was set to the default version. Unfortunately it uses a new URL scheme,
which wasn't supported yet by nxdbom. This patch adds this new format.

nxdbom/__init__.py

@@ -341,6 +341,7 @@ _gitlab_re = re.compile(r'/lab.nexedi.com/[\w\-]+/(?P<name>[\w\-]+)/repository/a
 _SF_re     = re.compile(r'/sourceforge.net/.+/(?P<name>[\w\_]+)-(?P<rev>[\w\.]+)/download$')
 _git_re    = re.compile(r'/(?P<name>[\w\.\-]+)\.git$')
 _go_re     = re.compile(r'/golang.org/dl/(?P<name>go)(?P<rev>[\w\.]+).src$')
+_go_dev_re = re.compile(r'/go.dev/dl/(?P<name>go)(?P<rev>[\w\.]+).src$')
 _osdn_f    = re.compile(r'/osdn.net/frs/redir.php\?f=(?P<f>.+)$')
 def namever(url, failonerr=True): # -> (name, ver)  | None if !failonerr
     # http://www.ijg.org/files/jpegsrc.v9d.tar.gz  ->  http://www.ijg.org/files/jpegsrc.v9d
@@ -376,7 +377,7 @@ def namever(url, failonerr=True): # -> (name, ver)  | None if !failonerr
     return name, ver
 
 def _namever(url, failonerr):
-    for r in (_gitweb_re, _github_re, _github_rre, _gitlab_re, _SF_re, _go_re):
+    for r in (_gitweb_re, _github_re, _github_rre, _gitlab_re, _SF_re, _go_re, _go_dev_re):
         m = r.search(url)
         if m is not None:
             return m.group('name'), m.group('rev')

nxdbom/nxdbom_test.py

@@ -30,6 +30,7 @@ from os.path import dirname, exists
     ('http://www.ijg.org/files/jpegsrc.v9d.tar.gz',                   'jpegsrc', '9d'),
     ('https://github.com/nghttp2/nghttp2/archive/v1.40.0.tar.gz',     'nghttp2', '1.40.0'),
     ('https://golang.org/dl/go1.18.9.src',                            'go',      '1.18.9'),
+    ('https://go.dev/dl/go1.20.6.src.tar.gz',                         'go',      '1.20.6'),
     ('https://github.com/tesseract-ocr/tesseract/archive/refs/tags/4.1.1.tar.gz',  'tesseract', '4.1.1'),
     ('https://raw.githubusercontent.com/zuphilip/ocropy-models/master/en-default.pyrnn.gz',  'ocropy-models', 'master'),
     ('https://sourceforge.net/projects/swig/files/swig/swig-3.0.12/swig-3.0.12.tar.gz/download',  'swig', '3.0.12'),