[Snyk] Security upgrade node from alpine to 23.11.1-alpine3.21

[PatF3lix]

Snyk has created this PR to fix 0 vulnerabilities in the dockerfile dependencies of this project.

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

Snyk changed the following file(s):

• my-portfolio/Dockerfile

We recommend upgrading to node:23.11.1-alpine3.21, as this image has only 0 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

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