workflows: bump BITCOIND_VERSION to 29

[mohamedawnallah]

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[Roasbeef]

LGTM 💥

[Roasbeef]

Changes look good, but the unit tests look to be failing.

FWIW, we've typically relied on the lnd lnwallet integration tests, but I do support updating these. I think we might be using some older commands/configs that have been deprecated.

[yyforyongyu]

Don't do it yet - let's finalize our CI pipeline and run tests against multiple versions of bitcoins first.