chore: update Node.js version in Dockerfile to 22-alpine for Cortex File Handler CFH

[ademgcl]

This pull request updates the base Node.js version used in the cortex-file-handler Dockerfile to ensure compatibility with newer dependencies and security updates.

Dependency update:

• Updated the base image in helper-apps/cortex-file-handler/Dockerfile from node:18-alpine to node:22-alpine to use the latest Node.js LTS version.

[Copilot]

Pull request overview

This PR updates the Node.js base image version in the Cortex File Handler Dockerfile from node:18-alpine to node:22-alpine to align with newer LTS releases and ensure compatibility with modern dependencies.

Changes:

• Updated the base Docker image from Node.js 18 to Node.js 22 in the cortex-file-handler Dockerfile

Comments suppressed due to low confidence (1)

helper-apps/cortex-file-handler/Dockerfile:9

• Corrected spelling of 'ffmepg' to 'ffmpeg'.

## installing ffmepg

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