Use the v6 version of the actor's bundle.

[lemmih]

Summary of changes
Changes introduced in this pull request:

• The actor's WASM bundle has moved to v7 to we need to explicitly ask for v6.
• Use serde_ipld_dagcbor instead of cs_serde_cbor for all encoding/decoding.

Reference issue to close (if applicable)

Other information and links

[codecov]

Codecov Report

Merging #1474 (f78f0af) into main (d52d4f7) will increase coverage by 0.02%.
The diff coverage is 64.18%.

@@            Coverage Diff             @@
##             main    #1474      +/-   ##
==========================================
+ Coverage   44.16%   44.19%   +0.02%     
==========================================
  Files         322      321       -1     
  Lines       28482    28373     -109     
==========================================
- Hits        12579    12539      -40     
+ Misses      15903    15834      -69     

Impacted Files	Coverage Δ
blockchain/blocks/src/header/mod.rs	64.80% <0.00%> (ø)
blockchain/chain_sync/src/chain_muxer.rs	1.49% <ø> (-1.46%)	⬇️
blockchain/chain_sync/src/validation.rs	18.91% <ø> (ø)
blockchain/message_pool/src/msgpool/utils.rs	57.89% <0.00%> (ø)
blockchain/state_manager/src/lib.rs	1.84% <0.00%> (ø)
ipld/car/src/lib.rs	82.75% <ø> (ø)
ipld/cid/src/lib.rs	100.00% <ø> (+15.55%)	⬆️
ipld/cid/tests/serde_tests.rs	100.00% <ø> (ø)
ipld/src/lib.rs	0.00% <0.00%> (-16.67%)	⬇️
ipld/src/selector/walk.rs	28.98% <0.00%> (ø)
... and 31 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d52d4f7...f78f0af. Read the comment docs.

[LesnyRumcajs]

Rock-solid! It's almost 50% fewer files touched than with the original FVM, we're getting there! 😄