chore: update golang version to 1.25.6 in Dockerfiles

[aruokhai]

Summary by CodeRabbit

• Chores
  • Updated Go version in Docker build configurations.

[coderabbitai]

Walkthrough

Go base image versions in both builder stages updated from 1.25.5 to 1.25.6 across server and wallet Dockerfiles with no changes to build steps or runtime configuration.

Changes

Cohort / File(s)	Summary
Go Builder Version Update server.Dockerfile, wallet.Dockerfile	Updated builder stage base image from golang:1.25.5 to golang:1.25.6.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• Upgrade Go version to 1.25.5 #249: Previous version bump of Go base image in builder stages (from 1.25.5 to 1.25.6)
• update golang image version in dockerfiles #202: Prior update to golang builder base image in the same Dockerfiles
• fix tests for v.0.7.1 #143: Earlier modifications to server.Dockerfile and wallet.Dockerfile builder stage base images

Suggested reviewers

• bordalix

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The pull request title accurately and concisely describes the main change: updating the golang base image version from 1.25.5 to 1.25.6 across two Dockerfiles (server.Dockerfile and wallet.Dockerfile).
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch bump-gosdk

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