fix(docker): upgrade python-plotting to 3.14.2-alpine for security patches

[Copilot]

Upgrades Python base image from 3.13.1-alpine to 3.14.2-alpine to address 4 vulnerabilities in SQLite and musl (2 critical, 2 high severity).

Before submitting this PR, please make sure:

• You have added a few sentences describing the PR here.
• The code passes all CI tests without any errors or warnings.
• You have added tests (when appropriate).
• You have added an entry in any relevant CHANGELOGs (when appropriate).
• If you have made any changes to the scripts/ or docker/ directories, please ensure any image versions have been incremented accordingly!
• You have updated the README or other documentation to account for these changes (when appropriate).

Changes

• docker/python-plotting/Dockerfile: Base image python:3.13.1-alpine → python:3.14.2-alpine
• docker/python-plotting/package.json: Version bump 2.0.6 → 2.0.7
• workflows/methylation/methylation-cohort.wdl: Container reference updated to 2.0.7

Security Impact

Fixes vulnerabilities:

• SNYK-ALPINE321-SQLITE-12675067 (Critical, CVE score 264)
• SNYK-ALPINE321-SQLITE-11191065 (Critical, CVE-2025-6965, CVE score 263)
• SNYK-ALPINE321-SQLITE-9712340 (High, CVE score 161)
• SNYK-ALPINE321-MUSL-8720634 (High, CVE-2025-26519, CVE score 139)

Original prompt

Pull Request: #285

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