ConnectionError in build_extrinsic_directory_metadata

https://sentry.softwareheritage.org/organizations/swh/issues/10454/?referrer=phabricator_plugin

gaierror: [Errno -2] Name or service not known
  File "urllib3/connection.py", line 159, in _new_conn
    (self._dns_host, self.port), self.timeout, **extra_kw)
  File "urllib3/util/connection.py", line 57, in create_connection
    for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM):
  File "socket.py", line 748, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):

NewConnectionError: <urllib3.connection.VerifiedHTTPSConnection object at 0x7f456c52f978>: Failed to establish a new connection: [Errno -2] Name or service not known
  File "urllib3/connectionpool.py", line 600, in urlopen
    chunked=chunked)
  File "urllib3/connectionpool.py", line 343, in _make_request
    self._validate_conn(conn)
  File "urllib3/connectionpool.py", line 841, in _validate_conn
    conn.connect()
  File "urllib3/connection.py", line 301, in connect
    conn = self._new_conn()
  File "urllib3/connection.py", line 168, in _new_conn
    self, "Failed to establish a new connection: %s" % e)

MaxRetryError: HTTPSConnectionPool(host='repo1.maven.org', port=443): Max retries exceeded with url: /maven2/com/tatzan/config-merger/0.0.4/config-merger-0.0.4.pom (Caused by NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7f456c52f978>: Failed to establish a new connection: [Errno -2] Name or service not known'))
  File "requests/adapters.py", line 449, in send
    timeout=timeout
  File "urllib3/connectionpool.py", line 638, in urlopen
    _stacktrace=sys.exc_info()[2])
  File "urllib3/util/retry.py", line 398, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))

ConnectionError: HTTPSConnectionPool(host='repo1.maven.org', port=443): Max retries exceeded with url: /maven2/com/tatzan/config-merger/0.0.4/config-merger-0.0.4.pom (Caused by NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7f456c52f978>: Failed to establish a new connection: [Errno -2] Name or service not known'))
(3 additional frame(s) were not displayed)
...
  File "requests/api.py", line 76, in get
    return request('get', url, params=params, **kwargs)
  File "requests/api.py", line 61, in request
    return session.request(method=method, url=url, **kwargs)
  File "requests/sessions.py", line 542, in request
    resp = self.send(prep, **send_kwargs)
  File "requests/sessions.py", line 655, in send
    r = adapter.send(request, **kwargs)
  File "requests/adapters.py", line 516, in send
    raise ConnectionError(e, request=request)

There should be some retry logic for this, as POM files are loaded from the same host as source code artefacts, so errors are (almost) guaranteed to be temporary

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Migrated from T4404 (view on Phabricator)