release: v1.26.3 (#11908) (#11915) (#11922)

* deps: update dependencies to address migration memory bloat

to address memory concerns during a heavy migration

Ref: filecoin-project/go-state-types#260
Ref: whyrusleeping/cbor-gen#96
Ref: filecoin-project/go-amt-ipld#90

* release: prep v1.26.3 patch

Prep v1.26.3 patch release:
- Update changelog, version and make gen + make docsgen-cli

* deps: update cbor-gen to tagged version

deps: update cbor-gen to tagged version

* deps: update go-state-types to tagged version

deps: update go-state-types to tagged version v0.13.2

* chore: deps: update go-state-types to v0.13.3

Fixes a panic when we have fewer than 1k proposals.

---------

Co-authored-by: Phi-rjan <orjan.roren@gmail.com>
Co-authored-by: Rod Vagg <rod@vagg.org>
Co-authored-by: Steven Allen <steven@stebalien.com>

CHANGELOG.md

@@ -6,6 +6,12 @@
 
 ## Improvements
 
+# v1.26.3 / 2024-04-22
+
+**This is a patch release that addresses high memory load concerns for the Lotus daemon in the coming network migration for network version 22, scheduled on epoch `3855360 - 2024-04-24 - 14:00:00Z`.**
+
+If your Lotus daemon is running on a machine with less memory and swap than 160GB, you should upgrade to this patch release to ensure you do not encounter any Out-Of-Memory issues during the pre-migration.
+
 # v1.26.2 / 2024-04-08
 
 **This is a mandatory patch release for the Filecoin network version 22 mainnet upgrade, for all node operators.**