Upgrade macOS image to 13

.github/workflows/bors.yml

@@ -38,7 +38,7 @@ jobs:
       contents: read # to fetch code (actions/checkout)
 
     name: macOS
-    runs-on: macos-12
+    runs-on: macos-13
     strategy:
       fail-fast: true
       matrix:
@@ -262,9 +262,9 @@ jobs:
       max-parallel: 4
       matrix:
         target:
-          - { toolchain: stable, os: macos-12 }
-          - { toolchain: beta, os: macos-12 }
-          - { toolchain: nightly, os: macos-12 }
+          - { toolchain: stable, os: macos-13 }
+          - { toolchain: beta, os: macos-13 }
+          - { toolchain: nightly, os: macos-13 }
           # Use macOS 11 for older toolchains as newer Xcode donesn't work well.
           # FIXME: Disabled due to:
           # error: failed to parse registry's information for: serde

.github/workflows/main.yml

@@ -30,7 +30,7 @@ jobs:
 
   macos:
     name: macOS
-    runs-on: macos-12
+    runs-on: macos-13
     strategy:
       fail-fast: true
       matrix:

libc-test/Cargo.toml

@@ -16,7 +16,8 @@ version = "0.2.150"
 default-features = false
 
 [build-dependencies]
-cc = "1.0.61"
+# FIXME: 1.0.84 has a bug about macOS version detection.
+cc = "=1.0.83"
 # FIXME: Use fork ctest until the maintainer gets back.
 ctest2 = "0.4.3"