PR/Commits called out in the changelog marked with ✅:

git log --oneline v1.34.3...release/v1.34.4
63f2f18 (release/v1.34.4) build: release Lotus Node and Miner v1.34.4-rc1
c3b13a6 (origin/release/v1.34.4, origin/release/miner/v1.34.4, origin/master, origin/HEAD, release/miner/v1.34.4, master)
✅ fix: fr32: Correct multithreaded Unpad chunk boundary alignment and simplify unpadReader (#13455)
7538c47 chore: fix some minor issues in the comments (#13454)
a2e7f60 docs: fix markdown link syntax and typo (#13453)
c72dad9 chore: bump version string in master-branch (#13452)
4bd77ab chore(release): cherry-pick v1.34.2 and v1.34.3 changelog back to master (#13451)
68dd25e (tag: v1.34.3, origin/release/v1.34.3, release/v1.34.3) build: release Lotus Node v1.34.3 (#13450)
7f90651 chore: remove obsolete // +build tag (#13440)
dc30466 fix(docker): upgrade base image from ubuntu:20.04 to ubuntu:22.04 (#13441)
7c2b3fa (tag: v1.34.2, tag: miner/v1.34.2, origin/release/v1.34.2, origin/release/miner/v1.34.2, release/v1.34.2, release/miner/v1.34.2) build: release Lotus Node and Miner v1.34.2 (#13439)
679e71f chore: omit unnecessary reassignment (#13438)
972f21c fix(grammar): fix article mistakes in comments and error messages (#13435)
fe1a56b docs: fix dead link (#13437)
098c7c2 docs: fix outdated link (#13436)
08dddeb chore(spcli): fix settle-deal batch count output msg (#13434)
9909aed (tag: v1.34.2-rc1, tag: miner/v1.34.2-rc1) build: release Lotus Node and Miner v1.34.2-rc1 (#13432)
e6a7b72 ci: fix release workflow (#13433)
8cb295c build: update Lotus Node and Miner version to v1.34.3-dev in master (#13431)

Only included the fr32 fix (#13455) in the changelog, since that is the only user-facing, functional change since last release.