changed branch name to vaild one

[Graur]

#141

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PR-Codex overview

This PR updates the naming convention for a library version and adds it to the environment file.

Detailed summary:

• Updated naming convention for library version from name:latest_version to name_latest_version
• Added the updated library version to the environment file using GITHUB_ENV
• Printed confirmation message indicating that the new version was added to the environment file.

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[Graur]

@yegor256 The last automatically created pull request failed with error: fatal: 'update-eo-strings:0.4.0' is not a valid branch name
It was my mistake. And I fixed it here. Could you please merge the changes once again?

[yegor256]

ok