Bump to 1.2.10 (#77)

1.2.9 shipped before the last seven merges landed, and one of them is holding
two live nodes hostage.

Measured on a 32-core node running 1.2.9 today: 65,134 MB committed, which is
30 RandomX datasets at 2,142 MB each -- one per miner thread, for a node that
advertises 2 GB. A 4-core node on the same build sits at 6,568 MB, three
datasets. #68 allocates the dataset once and closes the window where a thread
could mine against one that was not finished being filled.

The rest of the release:

- #67  orphans no longer stack above earned blocks in the GUI list
- #69  no submitting a solution for a parent that is no longer the tip
- #70  a ceiling on orphan blocks, and getblocks stops repeating itself
- #71  Berkeley DB cursors get closed instead of left to the handle
- #73  bounds on what a peer can make the node allocate
- #74  the recipient no longer collects the fee when a transaction retries

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