[Snyk] Security upgrade nginx from mainline-alpine to 1.25.3-alpine3.18

[nmanovic]

This PR was automatically created by Snyk using the credentials of a real user.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• Dockerfile.ui

We recommend upgrading to nginx:1.25.3-alpine3.18, as this image has only 0 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Issue	Exploit Maturity
	Missing Encryption of Sensitive Data SNYK-ALPINE318-CURL-6104720	No Known Exploit
	Missing Encryption of Sensitive Data SNYK-ALPINE318-CURL-6104720	No Known Exploit
	CVE-2023-46218 SNYK-ALPINE318-CURL-6104721	No Known Exploit
	CVE-2023-46218 SNYK-ALPINE318-CURL-6104721	No Known Exploit

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[codecov[bot]]

Codecov Report

Merging #7289 (c8424d6) into develop (f513aa1) will decrease coverage by 0.01%. The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7289      +/-   ##
===========================================
- Coverage    83.47%   83.46%   -0.01%     
===========================================
  Files          373      373              
  Lines        39739    39739              
  Branches      3741     3741              
===========================================
- Hits         33171    33168       -3     
- Misses        6568     6571       +3     

Components	Coverage Δ
cvat-ui	79.27% <ø> (-0.02%)	:arrow_down:
cvat-server	87.32% <ø> (-0.01%)	:arrow_down:

[bsekachev]

mainline-alpine has less vulnerabilities according to dockerhub.