go.mod: relax the Go version

[pellared]

Reverts CL 605935.

The toolchain issue should not be the reason to bump
the required Go version.
https://go.dev/ref/mod does not recommend setting the patch
version in the go directive.

[pellared]

Related to: grpc/grpc-go#7831

We have also similar issues in OpenTelemetry and other open source repositories.

Related comments:

• Unusual `go` directive in `go.mod` cilium/ebpf#1438
• cmd/go: mod tidy reports toolchain not available with 'go 1.21' go#62278 (comment)
• [go.mod] Change go directive to 1.21 cilium/ebpf#1441 (comment)
• Relax the minimum required Go version open-telemetry/opentelemetry-go-build-tools#666

[gopherbot]

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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[gopherbot]

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Patch Set 1:

(1 comment)

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Patch Set 2:

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Patch Set 2:

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Patch Set 2:

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