Drop bandit check B309

It was retired upstream: PyCQA/bandit#858

Continuing to list it causes CI failures like

    ERROR	Unknown test found in profile: B309

Change-Id: I52c535bd2078f25bb57c42a2c2c966247cd3094b

bandit.yaml

@@ -27,7 +27,6 @@
 # B306 : mktemp_q
 # B307 : eval
 # B308 : mark_safe
-# B309 : httpsconnection
 # B310 : urllib_urlopen
 # B311 : random
 # B312 : telnetlib
@@ -80,7 +79,7 @@
 # B703 : django_mark_safe
 
 # (optional) list included test IDs here, eg '[B101, B406]':
-tests: [B102, B103, B302, B303, B304, B305, B306, B308, B309, B310, B401, B501, B502, B506, B601, B602, B609]
+tests: [B102, B103, B302, B303, B304, B305, B306, B308, B310, B401, B501, B502, B506, B601, B602, B609]
 
 # (optional) list skipped test IDs here, eg '[B101, B406]':
 skips: