fix: bump version 2.1.1

[psyray]

Chores:

• Update the version number to 2.1.1 in the version.txt file.

CI:

• Add the 'v' before the release tag version for the release/x.x.x branch only
  If some users (including dev & reviewers) want to test the release branch, images must have the right name or they will face this message when doing a make pull
  

[sourcery-ai]

Reviewer's Guide by Sourcery

This is a straightforward version bump PR that updates the version number to 2.1.1 in the version.txt file.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Update version number to 2.1.1	Modify version number in version.txt	web/reNgine/version.txt

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[sourcery-ai]

Hey @psyray - I've reviewed your changes - here's some feedback:

Overall Comments:

• The diff appears to be incomplete - please ensure the actual version number changes are included in the PR
• Consider adding more context to the PR description about what bug fixes are included in this patch version bump

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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