Patches for Berkeley DB version 4.4.20

1. Fix a bug that could cause a trap during recovery if multiple operations that could remove the same extent were recovered. [#14061]

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2. Fix a bug that could cause traps or hangs if the DB_TXN->set_name function is used in a multithreaded application. [#14033]
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3. Fix a bug where cursor lookups on secondary databases with off-page duplicates could fail. [#14240]
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4. Fix a bug where cache buffer retrieval could race with a checkpoint call, potentially causing database environment recovery to fail. [#14657]
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