package/python3: security bump to version 3.9.5

package/python3: security bump to version 3.9.5

Fixes the following security issues:

- bpo-43434: Creating a sqlite3.Connection object now also produces a
  sqlite3.connect auditing event.  Previously this event was only produced
  by sqlite3.connect() calls.  Patch by Erlend E.  Aasland.

- bpo-43882: The presence of newline or tab characters in parts of a URL
  could allow some forms of attacks.
  Following the controlling specification for URLs defined by WHATWG
  urllib.parse() now removes ASCII newlines and tabs from URLs, preventing
  such attacks.

- bpo-43472: Ensures interpreter-level audit hooks receive the
  cpython.PyInterpreterState_New event when called through the
  _xxsubinterpreters module.

- bpo-36384: ipaddress module no longer accepts any leading zeros in IPv4
  address strings.  Leading zeros are ambiguous and interpreted as octal
  notation by some libraries.  For example the legacy function
  socket.inet_aton() treats leading zeros as octal notatation.  glibc
  implementation of modern inet_pton() does not accept any leading zeros.
  For a while the ipaddress module used to accept ambiguous leading zeros.

- bpo-43075: Fix Regular Expression Denial of Service (ReDoS) vulnerability
  in urllib.request.AbstractBasicAuthHandler.  The ReDoS-vulnerable regex
  has quadratic worst-case complexity and it allows cause a denial of
  service when identifying crafted invalid RFCs.  This ReDoS issue is on the
  client side and needs remote attackers to control the HTTP server.

- bpo-42800: Audit hooks are now fired for frame.f_code, traceback.tb_frame,
  and generator code/frame attribute access.

https://www.python.org/downloads/release/python-395/

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>