chore: bump celestia-app to v1.0.0-rc8

[evan-forbes]

Overview

this PR bumps node to rc8

Checklist

• New and updated code has appropriate documentation
• New and updated code has new and/or updated testing
• Required CI checks are passing
• Visual proof for any user facing features like CLI or documentation updates
• Linked issues closed with keywords

[codecov-commenter]

Codecov Report

Merging #2434 (6241e18) into main (387c160) will decrease coverage by 0.28%.
The diff coverage is 85.71%.

❗ Current head 6241e18 differs from pull request most recent head 35642c6. Consider uploading reports for the commit 35642c6 to get more accurate results

@@            Coverage Diff             @@
##             main    #2434      +/-   ##
==========================================
- Coverage   53.25%   52.97%   -0.29%     
==========================================
  Files         156      156              
  Lines        9915     9907       -8     
==========================================
- Hits         5280     5248      -32     
- Misses       4180     4203      +23     
- Partials      455      456       +1     

Impacted Files	Coverage Δ
nodebuilder/p2p/genesis.go	0.00% <ø> (ø)
core/exchange.go	34.00% <50.00%> (ø)
blob/helper.go	50.00% <100.00%> (ø)
core/eds.go	73.33% <100.00%> (+3.76%)	⬆️
core/listener.go	51.35% <100.00%> (ø)

... and 5 files with indirect coverage changes

[Wondertan]

Ah wait linter complains