1.26.0 Release

Note: This is the first release that includes support for a Privacy Manifest.

What's Changed

• Update upstream proto files on the 1.x branch. by @thomasvl in #1523
• Don't allow implementationOnly with package visibility. (1.x branch) by @thomasvl in #1532
• Update CI from 5.9.1 to 5.9.2 for the 1.x branch. by @thomasvl in #1534
• Update the proto files from upstream for the 1.x branch by @thomasvl in #1538
• Move to actions/checkout@v4 (on 1.x branch). by @thomasvl in #1544
• Add SwiftPM diagnose-api-breaking-changes check to 1_x branch. by @thomasvl in #1546
• Update upstream protos 1.x branch by @thomasvl in #1557
• [1_x_release_branch] Include "empty" privacy manifest file by @tbkka in #1566
• make fuzz and sanitizer tests not break CI. by @thomasvl in #1578
• Work around the Fuzz & Sanitizer issues on the 1.x branch by @thomasvl in #1581
• Add swift 5.10 to CI to the 1.x branch. by @thomasvl in #1570
• Drop a test on 1.x branch by @thomasvl in #1591
• Version bump to enable a release. by @thomasvl in #1584
• Pull the concurrency warnings fixes to the 1.x branch by @thomasvl in #1583
• Update xcodeproj on 1.x branch by @glbrntt in #1593
• Update proto files on the 1.x branch by @thomasvl in #1600

Full Changelog: 1.25.2...1.26.0