go.mod: fix go version format

[methane]

As of Go 1.21, toolchain versions must use the 1.N.P syntax. https://go.dev/doc/toolchain#version

Checklist

• Code compiles correctly
• Created tests which fail without the change (if possible)
• All tests passing
• Extended the README / documentation, if necessary
• Added myself / the copyright holder to the AUTHORS file

Summary by CodeRabbit

• Chores
  • Updated the internal language version specification for improved clarity and consistency.

[coderabbitai]

Walkthrough

The change updates the Go version specification in the module file. The go.mod file now uses the more precise version notation "go 1.21.0" instead of "go 1.21", ensuring clarity in the version used.

Changes

File	Change Summary
go.mod	Updated Go version from "go 1.21" to "go 1.21.0" for precise versioning

Possibly related PRs

• release v1.9.0 #1662: Updates the supported Go version to 1.21+ in the module file.
• ci: update Go and staticcheck versions #1639: Modifies the Go version requirement from 1.20 to 1.21, aligning with updated versioning practices.

Suggested reviewers

• shogo82148

Poem

I'm a clever rabbit, hopping in delight,
Updating Go's version, making it just right.
From 1.21 to 1.21.0 we gleefully bound,
In the go.mod file, precision is found.
CodeRabbit cheers as our changes astound! 🐇✨

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📥 Commits

Reviewing files that changed from the base of the PR and between c879816 and 941dc48.

📒 Files selected for processing (1)

• go.mod (1 hunks)

⏰ Context from checks skipped due to timeout of 90000ms (15)

• GitHub Check: test (windows-latest, 1.23, mariadb-10.5)
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🔇 Additional comments (1)

go.mod (1)

3-3: Precise Go Version Format Updated: The Go version has been updated from go 1.21 to go 1.21.0, which aligns with the new Go 1.21 requirements for the 1.N.P syntax. This change improves clarity and ensures compliance with the official Go documentation.

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[coveralls]

coverage: 82.946%. remained the same
when pulling 941dc48 on methane:fix-gomod
into c879816 on go-sql-driver:master.