[DEVPLAT-6703] Bump go version to v1.26.2

[Neurostep]

Description

In this PR we are bumping the go version to v1.26.2.

Alongside we also bump some dependencies needed for formatting, linting, and debugging.

Additionally, the go fix ./... was executed to update the code base to use modern Go syntax style.

Checklist

• Prefixed the PR title with the JIRA ticket code
• Performed simple, atomic commits with good commit messages
• Verified that the commit history is linear and commits are squashed as necessary
• Thoroughly tested the changes in development and/or staging
• Updated the README.md as necessary

Related links

• DEVPLAT-6703
• https://go.dev/blog/gofix
• https://go.dev/doc/go1.26

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Note

Medium Risk
Medium risk due to a Go toolchain upgrade plus widespread mechanical signature/type tweaks (interface{}→any) and small concurrency/logging refactors that could cause subtle build or behavior differences across the SDK surface.

Overview
Upgrades the SDK toolchain to Go 1.26.2 (Docker build image, go.mod, and README) and refreshes dev tooling versions (golangci-lint, goimports, dlv).

Applies gofix-style modernizations across the codebase: broad interface{}→any updates in public APIs (logger, transport encode/decode funcs, gRPC interceptors, config helpers), uses standard-library helpers like maps.Copy, min, fmt.Appendf, strings.SplitSeq, range N, and WaitGroup.Go, and removes a few temporary variables/formatting steps while keeping log messages equivalent.

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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Dead empty args slice masks format string misuse

Low Severity

The args variable is created as an empty slice and never populated, then spread into every Errorf/Warnf/Infof/Debugf call. This is dead code that only serves to silence the Go 1.24+ go vet "non-constant format string with no args" check. Since msg from kgo.Logger.Log is a plain message string (not a format string), the correct approach is logEntry.Errorf("%s", msg) — which both properly silences the diagnostic and prevents % characters in msg from being misinterpreted as format verbs.

 

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[Neurostep]

That is relevant but pretty minor thus we can ignore it