Mark release/2.0 as fully merged into release/2.1

* release/2.0:
  BUMP v2.0.1
  GODRIVER-3477 Bump golang.org/x/crypto from 0.29.0 to 0.31.0 [release/2.0] (#1952)
  GODRIVER-3284 Allow valid SRV hostnames with less than 3 parts. (#1898) [release/2.0] (#1949)
  GODRIVER-3452 MergeClientOptions returns object when given nil arguments (#1917) [release/2.0] (#1948)
  GODRIVER-3443 Remove internal APIs in migration guide. (#1911) [release/2.0] (#1951)
  GODRIVER-3470 Correct BSON unmarshaling logic for null values (#1924) [master] (#1945) [release/2.0] (#1947)
  Fix erroneous nil error return in FindOne. (#1926) [release/2.0] (#1944)
  GODRIVER-3298 Handle joined errors correctly in WithTransaction. (#1928) [release/2.0] (#1931)
  GODRIVER-3307 clone returned byte slice in MarshalValue (#1913) [release/2.0] (#1921)

Author: alcaeus