chore: Go mod tidy on QGB branch

[rach-id]

I was using go 1.19 and also the version of the cosmos-sdk specified wasn't right.

[rach-id]

Link to succeeding CI: https://github.com/celestiaorg/celestia-app/actions/runs/3104235324/jobs/5028475052

[codecov-commenter]

Codecov Report

Merging #767 (7bd08a3) into qgb-integration (d94943d) will decrease coverage by 0.97%.
The diff coverage is n/a.

❗ Current head 7bd08a3 differs from pull request most recent head 8079d56. Consider uploading reports for the commit 8079d56 to get more accurate results

@@                 Coverage Diff                 @@
##           qgb-integration     #767      +/-   ##
===================================================
- Coverage            23.33%   22.36%   -0.98%     
===================================================
  Files                   71       62       -9     
  Lines                 8801     7665    -1136     
===================================================
- Hits                  2054     1714     -340     
+ Misses                6575     5809     -766     
+ Partials               172      142      -30     

Impacted Files	Coverage Δ
pkg/shares/utils.go	4.08% <0.00%> (-22.45%)	⬇️
pkg/shares/share_splitting.go	59.75% <0.00%> (-4.17%)	⬇️
app/module.go
app/export.go
app/process_proposal.go
app/app.go
app/prepare_proposal.go
app/malleate_txs.go
app/parse_txs.go
app/test_util.go
... and 4 more

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[rootulp]

I was using go 1.19 and also the version of the cosmos-sdk specified wasn't right.

FWIW celestia-node has upgraded to Go 1.19 (ref) so it seems like time for us to consider upgrading as well #769