[6.1] Update SwiftPM/CMake dependencies to match toolchain build

[jmschonfeld]

• Explanation: Updates the dependencies declared in the SwiftPM package manifest and CMakeLists.txt files to match the versions of the dependencies actually used when building the toolchain. Having these be correct will be important when making lockstep changes (for example, between swift-foundation and swift-syntax) so that if a dependency like swift-syntax makes a breaking change on main it will not break the build of our package's release/6.1 branch due to incorrectly depending on the wrong branch.
• Scope: Only affects the version of used dependencies and does not change the project's code itself. Also only impacts "local" builds and not any toolchain builds
• Issues: N/A
• Original PRs: N/A
• Risk: Low - does not impact toolchain build and change is intended to have no effect currently
• Testing: SwiftPM build is tested in CI, and I've tested both the SwiftPM and standalone CMake build locally
• Reviewers: N/A

[jmschonfeld]

@swift-ci please test