[WIK-2267] Switch 1.39 bundle to patched MassMessage (Canasta #536 equivalent)

[tosfos]

What

Adds a Gerrit patch-ref fetch to the MassMessage clone step in the 1.39-bundle Dockerfile:

&& git fetch https://gerrit.wikimedia.org/r/mediawiki/extensions/MassMessage refs/changes/60/1198560/1 \
&& git checkout FETCH_HEAD \

Why

The 1.39 bundle pins MassMessage at d6a86291bb975c3dc7778f370006f1145cc834bd, which lacks the MassMessageJobBeforeMessageSent hook (Gerrit change 1198560). This replicates the intent of upstream Canasta PR CanastaWiki#536 ("Checks out MassMessage REL1_39 onto patched version"), which Taqasta's 1.39 bundle did not yet include. Taqasta already cloned from Gerrit (the other half of upstream CanastaWiki#536), so only the patch-ref fetch was missing. The fetch+checkout can be dropped once Gerrit change 1198560 lands in the REL1_39 branch.

Validation (no full image build)

• Replicated the Dockerfile steps in a temp dir: git clone --single-branch -b REL1_39 → checkout d6a8629... → git fetch ... refs/changes/60/1198560/1 → git checkout FETCH_HEAD
• Base tree: hook absent; after checkout of FETCH_HEAD (cf374f74): includes/Job/MassMessageJob.php:323 contains MassMessageJobBeforeMessageSent ✓
• Verified pinned base d6a8629... is an ancestor of the fetched patch commit
• hadolint -c hadolint.yaml Dockerfile: exit 0 (remaining findings are pre-existing, unrelated lines)

Ticket

https://wikiteq.atlassian.net/browse/WIK-2267

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