[xcode26.6] Bump to Xcode 26.6 Release Candidate

[dalexsoto]

No description provided.

[dalexsoto]

/azp run

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Azure Pipelines successfully started running 3 pipeline(s).

[Copilot]

Pull request overview

This PR updates the repository’s build/version configuration to target the Xcode 26.6 Release Candidate on the xcode26.6 branch, ensuring CI/bots select the correct Xcode channel and local builds point at the correct Xcode install.

Changes:

• Switch CI pipeline configuration to use the Beta Xcode channel (appropriate for beta/RC machines).
• Bump the repo’s Xcode version constant to 26.6.
• Update Make.config to use Xcode 26.6 RC (version, download URL, developer root) and adjust the simulator-version special-case for this Xcode version.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tools/devops/automation/templates/variables/common.yml	Sets xcodeChannel to Beta so CI targets beta/RC Xcode images.
tools/common/SdkVersions.cs	Updates SdkVersions.Xcode to 26.6 for tooling/version checks.
Make.config	Points build logic at Xcode 26.6 RC and updates the max simulator version override for XCODE_VERSION=26.6.

[dalexsoto]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[vs-mobiletools-engineering-service2]

✅ [PR Build #b040e1d] Build passed (Detect API changes) ✅

Pipeline on Agent
Hash: b040e1df94b793546dc0e47809d5018a32fe10fa [PR build]

[vs-mobiletools-engineering-service2]

🔥 Failed to compare API and create generator diff 🔥

Error: 'make' failed for the hash 8132813.

Pipeline on Agent
Hash: b040e1df94b793546dc0e47809d5018a32fe10fa [PR build]

[vs-mobiletools-engineering-service2]

✅ [PR Build #b040e1d] Build passed (Build packages) ✅

Pipeline on Agent
Hash: b040e1df94b793546dc0e47809d5018a32fe10fa [PR build]

[vs-mobiletools-engineering-service2]

✅ [PR Build #b040e1d] Build passed (Build macOS tests) ✅

Pipeline on Agent
Hash: b040e1df94b793546dc0e47809d5018a32fe10fa [PR build]

[vs-mobiletools-engineering-service2]

🚀 [CI Build #b040e1d] Test results 🚀

Test results

✅ All tests passed on VSTS: test results.

🎉 All 175 tests passed 🎉

Tests counts

✅ cecil: All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (iOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (MacCatalyst): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (macOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (Multiple platforms): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (tvOS): All 1 tests passed. Html Report (VSDrops) Download
✅ framework: All 2 tests passed. Html Report (VSDrops) Download
✅ fsharp: All 4 tests passed. Html Report (VSDrops) Download
✅ generator: All 5 tests passed. Html Report (VSDrops) Download
✅ interdependent-binding-projects: All 4 tests passed. Html Report (VSDrops) Download
✅ introspection: All 6 tests passed. Html Report (VSDrops) Download
✅ linker: All 44 tests passed. Html Report (VSDrops) Download
✅ monotouch (iOS): All 16 tests passed. Html Report (VSDrops) Download
✅ monotouch (MacCatalyst): All 18 tests passed. [attempt 2] Html Report (VSDrops) Download
✅ monotouch (macOS): All 18 tests passed. Html Report (VSDrops) Download
✅ monotouch (tvOS): All 16 tests passed. Html Report (VSDrops) Download
✅ msbuild: All 2 tests passed. Html Report (VSDrops) Download
✅ sharpie: All 1 tests passed. Html Report (VSDrops) Download
✅ windows: All 3 tests passed. Html Report (VSDrops) Download
✅ xcframework: All 4 tests passed. Html Report (VSDrops) Download
✅ xtro: All 1 tests passed. Html Report (VSDrops) Download

macOS tests

✅ Tests on macOS Monterey (12): All 5 tests passed. Html Report (VSDrops) Download
✅ Tests on macOS Ventura (13): All 5 tests passed. Html Report (VSDrops) Download
✅ Tests on macOS Sonoma (14): All 5 tests passed. Html Report (VSDrops) Download
✅ Tests on macOS Sequoia (15): All 5 tests passed. Html Report (VSDrops) Download
✅ Tests on macOS Tahoe (26): All 5 tests passed. Html Report (VSDrops) Download

Linux Build Verification

✅ Linux build succeeded

Pipeline on Agent
Hash: b040e1df94b793546dc0e47809d5018a32fe10fa [PR build]