fix(gatsby): change migration version for gatsby 3.10

[FrozenPandaz]

Current Behavior

Runs the migration to update gatsby to 3.10 in 12.6.1-beta.0

Expected Behavior

Runs the migration to update gatsby to 3.10 earlier in 12.6.0-beta.12

Related Issue(s)

Fixes #

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/nrwl/nx-dev/ixA7V1ghDQhuSZKjV2ewDDvLjUhZ
✅ Preview: Canceled

[nx-cloud]

Nx Cloud Report

CI ran the following commands for commit c251e48. Click to see the status, the terminal output, and the build insights.

📂 See all runs for this branch

Status	Command
	nx affected --target=build --base=6d25d204c394b98a67a458f8cba6791ac88b3128 --parallel --max-parallel=3
	nx affected --target=e2e --base=6d25d204c394b98a67a458f8cba6791ac88b3128
	nx affected --target=lint --base=6d25d204c394b98a67a458f8cba6791ac88b3128 --parallel --max-parallel=4
	nx affected --target=test --base=6d25d204c394b98a67a458f8cba6791ac88b3128 --parallel --max-parallel=2
	nx build typedoc-theme

---

Sent with 💌 from NxCloud.

[github-actions]

This pull request has already been merged/closed. If you experience issues related to these changes, please open a new issue referencing this pull request.