build: docker: Update GO-version

[rjan90]

Related Issues

Should fix #10578

Proposed Changes

• Update Go-version in dockerfile
• Update Go-version in readme

Additional Info

Checklist

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• PR title is in the form of of <PR type>: <area>: <change being made>
  • example: fix: mempool: Introduce a cache for valid signatures
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• Tests exist for new functionality or change in behavior
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