fix(ci): fix macOS x86_64 static builds

GitHub's macos-12 CI runners changed the installed LLVM version from 14
to 15 [1]. This breaks our builds which assume LLVM version 14.

Switch to LLVM version 15 to fix the broken builds.

[1] actions/runner-images#6956

Author: strager

.github/workflows/build-and-test-plugin-vscode.yml

@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         os:
-          - {runs_on: macos-12, name: "macOS x86_64", platform_arch: "darwin-x64", test: true, CC: /usr/local/opt/llvm@14/bin/clang, CXX: /usr/local/opt/llvm@14/bin/clang++, CFLAGS: "-isystem /usr/local/opt/llvm@14/include -isystem /usr/local/opt/llvm@14/include/c++/v1 -mmacosx-version-min=10.9 -D_LIBCPP_DISABLE_AVAILABILITY", LDFLAGS: "-L/usr/local/opt/llvm@14/lib -mlinker-version=278 -nostdlib++ /usr/local/opt/llvm@14/lib/c++/libc++.a /usr/local/opt/llvm@14/lib/c++/libc++abi.a"}
+          - {runs_on: macos-12, name: "macOS x86_64", platform_arch: "darwin-x64", test: true, CC: /usr/local/opt/llvm@15/bin/clang, CXX: /usr/local/opt/llvm@15/bin/clang++, CFLAGS: "-isystem /usr/local/opt/llvm@15/include -isystem /usr/local/opt/llvm@15/include/c++/v1 -mmacosx-version-min=10.9 -D_LIBCPP_DISABLE_AVAILABILITY", LDFLAGS: "-L/usr/local/opt/llvm@15/lib -mlinker-version=278 -nostdlib++ /usr/local/opt/llvm@15/lib/c++/libc++.a /usr/local/opt/llvm@15/lib/c++/libc++abi.a"}
           - {runs_on: stracle-macos-aarch64, name: "macOS AArch64", platform_arch: "darwin-arm64", test: true, CFLAGS: "-mmacosx-version-min=11.0"}
             # NOTE(strager): We test on Linux x86_64 in the build-extension job.
           - {runs_on: ubuntu-latest, name: "Linux x86_64", platform_arch: "linux-x64", test: false, docker_container: "ghcr.io/quick-lint/quick-lint-js-github-builder:v1", CC: gcc-8, CXX: g++-8, LDFLAGS: "-static-libgcc -static-libstdc++"}

.github/workflows/build-static.yml

@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         toolchain:
-          - {runs_on: macos-12, name: "macOS x86_64", archive_name: "macos", archive_extension: ".tar.gz", test: true, CC: /usr/local/opt/llvm@14/bin/clang, CXX: /usr/local/opt/llvm@14/bin/clang++, CFLAGS: "-isystem /usr/local/opt/llvm@14/include -isystem /usr/local/opt/llvm@14/include/c++/v1 -mmacosx-version-min=10.9 -D_LIBCPP_DISABLE_AVAILABILITY", LDFLAGS: "-L/usr/local/opt/llvm@14/lib -mlinker-version=278 -nostdlib++ /usr/local/opt/llvm@14/lib/c++/libc++.a /usr/local/opt/llvm@14/lib/c++/libc++abi.a"}
+          - {runs_on: macos-12, name: "macOS x86_64", archive_name: "macos", archive_extension: ".tar.gz", test: true, CC: /usr/local/opt/llvm@15/bin/clang, CXX: /usr/local/opt/llvm@15/bin/clang++, CFLAGS: "-isystem /usr/local/opt/llvm@15/include -isystem /usr/local/opt/llvm@15/include/c++/v1 -mmacosx-version-min=10.9 -D_LIBCPP_DISABLE_AVAILABILITY", LDFLAGS: "-L/usr/local/opt/llvm@15/lib -mlinker-version=278 -nostdlib++ /usr/local/opt/llvm@15/lib/c++/libc++.a /usr/local/opt/llvm@15/lib/c++/libc++abi.a"}
           - {runs_on: stracle-macos-aarch64, name: "macOS AArch64", archive_name: "macos-aarch64", archive_extension: ".tar.gz", test: true, CFLAGS: "-mmacosx-version-min=11.0"}
           - {runs_on: ubuntu-latest, name: "Linux x86_64", archive_name: "linux", archive_extension: ".tar.gz", docker_container: "ghcr.io/quick-lint/quick-lint-js-github-builder:v5", test: true, CC: gcc-8, CXX: g++-8, LDFLAGS: "-static-libgcc -static-libstdc++", CMAKE_FLAGS: "-DQUICK_LINT_JS_DISABLE_LTO_FOR_LSP_SERVER_TO_WORK_AROUND_GCC_LTO_CRASH=YES"}
           - {runs_on: ubuntu-latest, name: "Linux ARM", archive_name: "linux-armhf", archive_extension: ".tar.gz", docker_container: "ghcr.io/quick-lint/quick-lint-js-github-cross-builder:v2", test: false, CMAKE_FLAGS: "-DCMAKE_TOOLCHAIN_FILE=.github/toolchain-linux-armhf.cmake -G Ninja", LDFLAGS: "-static-libgcc -static-libstdc++"}