update macOS wheel minimum to 10.13

The coarsetime crate already had us limited to 10.12+, and the wheel
had just not been updated to reflect that. Increased to 10.13, as that's
the minimum the Qt 5.14 libraries support.

pylib/anki/BUILD.bazel

@@ -72,7 +72,7 @@ py_wheel(
     },
     platform = select({
         "//platforms:windows_x86_64": "win_amd64",
-        "//platforms:macos_x86_64": "macosx_10_7_x86_64",
+        "//platforms:macos_x86_64": "macosx_10_13_x86_64",
         "//platforms:linux_x86_64": "manylinux_2_28_x86_64",
         "//platforms:linux_arm64": "manylinux_2_28_aarch64",
     }),

pylib/rsbridge/BUILD.bazel

@@ -18,7 +18,7 @@ rust_library(
         ): [
             "-Clink-arg=-undefined",
             "-Clink-arg=dynamic_lookup",
-            "-Clink-arg=-mmacosx-version-min=10.7",
+            "-Clink-arg=-mmacosx-version-min=10.13",
         ],
         "//conditions:default": [],
     }),