fix(ci): bump verify-flatpak's vendored Gradle dist to 9.7.1 to match the wrapper

[jamesarich]

Why

#6777 bumped gradle-wrapper.properties to Gradle 9.7.1, but scripts/verify-flatpak/desktop-offline.yaml vendors the distribution zip for the offline flatpak build and stayed at 9.6.1 — its own comment says "Update together." The wrapper now verifies the vendored zip against 9.7.1's checksum and fails: every PR since the bump fails both build-flatpak arches with Expected acd53f… / Actual 9c0f7f… (observed on #6779 and renovate/gradle-9.x).

🛠️ Change

One coupled pin: url → gradle-9.7.1-bin.zip, sha256 → acd53f1e… (the same value distributionSha256Sum on main verifies every wrapper download against).

Renovate has no manager for this yaml — follow-up candidate: a customManagers regex entry so the next wrapper bump updates both sides atomically.

Testing Performed

Pin now matches main's gradle-wrapper.properties exactly (version, -bin flavor, sha). Verification is this PR's own build-flatpak checks, which exercise the changed path directly — they fail on main's tip without this change.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Updated the bundled Gradle version to 9.7.1.
  • Refreshed the associated integrity checksum.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 262d000c-b225-4108-b32e-bed1562d2e7e

📥 Commits

Reviewing files that changed from the base of the PR and between 4d9cf8e and 0885b86.

📒 Files selected for processing (1)

• scripts/verify-flatpak/desktop-offline.yaml

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📝 Walkthrough

Walkthrough

The offline Flatpak configuration updates its bundled Gradle binary from version 9.6.1 to 9.7.1 and replaces the SHA-256 checksum.

Changes

Gradle bundle update

Layer / File(s)	Summary
Update Gradle binary source scripts/verify-flatpak/desktop-offline.yaml	The configuration downloads Gradle 9.7.1 and uses its corresponding SHA-256 checksum.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 0885b

The vendored Gradle distribution and checksum are updated to match the wrapper, restoring the offline Flatpak verification path. No actionable merge-blocking risk remains after normal checks and review.

Suggested reviewers: simulationstation

🚥 Pre-merge checks | ✅ 8

✅ Passed checks (8 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the CI fix and the Gradle distribution update to version 9.7.1.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Sibling Call Sites And Presence Semantics	✅ Passed	The diff only changes the Flatpak Gradle URL and SHA-256 in desktop-offline.yaml; it changes no nullable/default field, guard, presence check, or call site.
Tests Prove The Path, Not The End State	✅ Passed	The diff changes only two Gradle URL/checksum lines in a Flatpak manifest; no test files or test assertions were added or changed, so this check is not applicable.
Regression Coverage For Changed Behavior	✅ Passed	The diff only changes the vendored Gradle URL and SHA-256 pin; both match gradle-wrapper.properties. This is an exempt dependency version bump, with no new behavior requiring regression tests.
Moved Code Diffed Against Its Original	✅ Passed	The exact diff changes only a Gradle URL and SHA-256 value in one YAML file; it moves no type or function and creates no moved-code call-site risk.

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