smb: fix for IBM iSeries and signature verification

This commit updates go-smb2 to a version that fixes the following issues.

- Issue connecting to SMB share from IBM iSeries
  (see https://forum.rclone.org/t/smb-shares-on-ibm-iseries-update/53550)
- Fix for signature verification for async STATUS_PENDING response which
  resolves a transfer issue with Lenovo DSS-G.
  (see https://github.com/CloudSoda/go-smb2/pull/48)

It also provides additional security hardening, fixing panics on malicious
server input
(see https://github.com/CloudSoda/go-smb2/pull/51)

(cherry picked from commit bf2945bf40)
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