Swift 6.1 Release

What's Changed

• [CMake] Resolve module map conflict with duplicate in SDK by @jmschonfeld in #36
• [6.0] Add explicit modulemap path to take priority over modulemap from SDK by @jmschonfeld in #37
• Hide all ICU public C++ Symbols by @iCharlesHu in #34
• Ensure that SimpleDateFormat::fUsePlainSpaces is always initialized by @jmschonfeld in #40
• Upgrade to ICU 74 by @iCharlesHu in #39
• Apply WASI support patch against ICU source tree by @kateinoigakukun in #35
• CMake: Fix accidental variable expansion of WASI by @kateinoigakukun in #45
• Delete CODE_OF_CONDUCT.md by @parispittman in #46
• Update CONTRIBUTING.md by @parispittman in #48

New Contributors

• @parispittman made their first contribution in #46

Full Changelog: swift-6.0.3-RELEASE...swift-6.1-RELEASE