ci(release): squeeze extra blank lines in docs go.mod

[doringeman]

Fix extra blank line in docs go.mod.
E.g., https://github.com/docker/docs/pull/24548/changes#diff-33ef32bf6c23acb95f5902d7097b7a1d5128ca061167ec0716715b0b9eeaa5f6.

[gemini-code-assist]

Note

Gemini is unable to generate a review for this pull request due to the file types involved not being currently supported.

[sourcery-ai]

Hey - I've left some high level feedback:

• Since you’re already streaming go.mod through awk, consider folding the blank-line squeezing into that awk script instead of adding a separate cat -s pass and second temp-file/mv cycle.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Since you’re already streaming go.mod through awk, consider folding the blank-line squeezing into that awk script instead of adding a separate `cat -s` pass and second temp-file/mv cycle.

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