sslutil: use proper attribute to select python 3.7+
The previous attribute was python 3.6+, but guarded a python 3.7+ block.
Using the correct attribute avoids:
File "/usr/lib64/python3.6/site-packages/mercurial/sslutil.py", line 334, in wrapsocket
sslcontext.minimum_version = ssl.TLSVersion.TLSv1_1
AttributeError: module 'ssl' has no attribute 'TLSVersion'
--- a/mercurial/sslutil.py Wed Jul 06 11:52:26 2022 +0400
+++ b/mercurial/sslutil.py Tue Jul 12 15:59:53 2022 +0200
@@ -312,7 +312,7 @@
# is loaded and contains that removed CA, you've just undone the user's
# choice.
- if util.safehasattr(ssl, 'PROTOCOL_TLS_CLIENT'):
+ if util.safehasattr(ssl, 'TLSVersion'):
# python 3.7+
sslcontext = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
minimumprotocol = settings[b'minimumprotocol']