build(deps): Bump github.com/bufbuild/buf from 1.20.0 to 1.21.0

[dependabot[bot]]

Bumps github.com/bufbuild/buf from 1.20.0 to 1.21.0.

Release notes

Sourced from github.com/bufbuild/buf's releases.

v1.21.0

• Fix issue where locally-produced images did not have module information if the corresponding module was stored in the new cache.
• Remove buf beta registry template.
• Remove buf beta registry plugin {create,deprecate,list,undeprecate,version} and replace with buf beta registry plugin {push,delete}.
• Update buf beta price with the latest pricing information.

Changelog

Sourced from github.com/bufbuild/buf's changelog.

[v1.21.0] - 2023-06-05

• Fix issue where locally-produced images did not have module information if the corresponding module was stored in the new cache.
• Remove buf beta registry template.
• Remove buf beta registry plugin {create,deprecate,list,undeprecate,version} and replace with buf beta registry plugin {push,delete}.
• Update buf beta price with the latest pricing information.

Commits

• cad0d23 Release v1.21.0 (#2157)
• 78537dd Test cached module identity (#2159)
• 206dd16 Run make upgrade (#2160)
• 8064423 Add dag package (#2141)
• 26992a1 Update changelog (#2158)
• 967b9de Properly set ModuleIdentity and commit when reading from cache (#2152)
• 6eba05b Add .c, .cc, .h files for license header (#2148)
• dab6a5b Update to latest connect-go and makego (#2147)
• 3825738 Update buf beta price with the latest pricing information (#2146)
• a3ed389 Implement buf alpha repo sync (#2122)
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

Merging #630 (c084fe1) into main (d781e60) will increase coverage by 0.01%. The diff coverage is n/a.

:exclamation: Current head c084fe1 differs from pull request most recent head 55ed64d. Consider uploading reports for the commit 55ed64d to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #630 +/- ## ========================================== + Coverage 66.19% 66.20% +0.01% ========================================== Files 277 277 Lines 36992 36969 -23 ========================================== - Hits 24486 24477 -9 + Misses 10746 10728 -18 - Partials 1760 1764 +4 ``` [see 15 files with indirect coverage changes](https://app.codecov.io/gh/Finschia/ostracon/pull/630/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Finschia)