Complete Python 3.14.2-alpine upgrade with container versioning (#290)

Snyk's automated PR updated the Dockerfile but missed the repository's
container versioning system. Container images are tagged as
`{version}-{revision}` based on `package.json`, and workflows reference
these tags explicitly.

## Changes

- Incremented `docker/umap/package.json` revision: `10` → `11`
- Updated `workflows/methylation/methylation-cohort.wdl` container tag:
`ghcr.io/stjudecloud/umap:0.5.7-10` → `0.5.7-11`

This ensures the Python 3.14.2-alpine base image (fixing 2 critical + 2
high severity vulnerabilities) is properly versioned and consumed by
dependent workflows.

Before submitting this PR, please make sure:

- [x] 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).
- [x] 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).

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<summary>Original prompt</summary>

> Pull Request: #286


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Author: Copilot

docker/umap/package.json

@@ -1,5 +1,5 @@
 {
     "name": "umap",
     "version": "0.5.7",
-    "revision": "10"
+    "revision": "11"
 }

workflows/methylation/methylation-cohort.wdl

@@ -285,7 +285,7 @@ task generate_umap {
     }
 
     runtime {
-        container: "ghcr.io/stjudecloud/umap:0.5.7-10"
+        container: "ghcr.io/stjudecloud/umap:0.5.7-11"
         memory: "8 GB"
         cpu: 1
         disks: "~{disk_size_gb} GB"