Upgrade to Xcode 13.2.1

CircleCI announcement: https://discuss.circleci.com/t/xcode-13-2-1-released/42334
Full software list: https://circle-macos-docs.s3.amazonaws.com/image-manifest/v6690/index.html

.circleci/config.yml

@@ -517,7 +517,7 @@ jobs:
 
   Check Swift formatting:
     macos:
-      xcode: "13.0.0"
+      xcode: "13.2.1"
     steps:
       - checkout
       - run:
@@ -533,7 +533,7 @@ jobs:
 
   iOS build and test:
     macos:
-      xcode: "13.0.0"
+      xcode: "13.2.1"
     steps:
       - checkout
       - run:
@@ -643,7 +643,7 @@ jobs:
 
   iOS integration test:
     macos:
-      xcode: "13.0.0"
+      xcode: "13.2.1"
     steps:
       - checkout
       - skip-if-doc-only
@@ -708,7 +708,7 @@ jobs:
 
   iOS Framework release:
     macos:
-      xcode: "13.0.0"
+      xcode: "13.2.1"
     steps:
       - checkout
       - attach_workspace:
@@ -946,7 +946,7 @@ jobs:
 
   pypi-macos-release:
     macos:
-      xcode: "13.0.0"
+      xcode: "13.2.1"
     steps:
       - install-rustup
       - setup-rust-toolchain
@@ -978,7 +978,7 @@ jobs:
 
   pypi-macos-arm64-release:
     macos:
-      xcode: "13.0.0"
+      xcode: "13.2.1"
     steps:
       - install-rustup
       - setup-rust-toolchain