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tests: upgrade bundles/rebase.hg to support test-rebase-collapse

Add two changesets to the scenario so that the bundle can be reused
within three tests.

Before:
  @  5: 'F'
  |
  | o  4: 'E'
  |/|
  o |  3: 'D
  | |
  | o  2: 'C'
  |/
  | o  1: 'B'
  |/
  o  0: 'A'

After:
  @  7: 'H'
  |
  | o  6: 'G'
  |/|
  o |  5: 'F'
  | |
  | o  4: 'E'
  |/
  | o  3: 'D'
  | |
  | o  2: 'C'
  | |
  | o  1: 'B'
  |/
  o  0: 'A'

Revisions 0-1 keep the same number/label. Others were translated by
an offset of 2 (2.C -> 4.E)

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