Update to latest Swift and Xcode versions (#6638)

Author: SimplyDanny

.github/workflows/build.yml

@@ -10,7 +10,7 @@ permissions:
 
 jobs:
   bazel_linux:
-    name: Bazel, Linux, Swift 6.2 # pre-installed
+    name: Bazel, Linux, Swift 6.3 # pre-installed
     runs-on: ubuntu-24.04
     steps:
       - &checkout-step
@@ -41,6 +41,8 @@ jobs:
             version: '6.1'
           - image: swift:6.2-noble
             version: '6.2'
+          - image: swift:6.3-noble
+            version: '6.3'
     container: ${{ matrix.image }}
     steps:
       - *checkout-step

.github/workflows/release.yml

@@ -13,7 +13,7 @@ on:
         type: string
 
 env:
-  DEVELOPER_DIR: /Applications/Xcode_26.4.app
+  DEVELOPER_DIR: /Applications/Xcode_26.5.app
   RELEASE_BRANCH: release/${{ inputs.version }}
   MIMALLOC_VERSION: 3.0.10
 
@@ -142,7 +142,7 @@ jobs:
     steps:
       - *checkout-release-branch
       - name: Install SDK
-        run: swift sdk install https://download.swift.org/swift-6.2.3-release/static-sdk/swift-6.2.3-RELEASE/swift-6.2.3-RELEASE_static-linux-0.0.1.artifactbundle.tar.gz --checksum f30ec724d824ef43b5546e02ca06a8682dafab4b26a99fbb0e858c347e507a2c
+        run: swift sdk install https://download.swift.org/swift-6.3.2-release/static-sdk/swift-6.3.2-RELEASE/swift-6.3.2-RELEASE_static-linux-0.1.0.artifactbundle.tar.gz --checksum 3fd798bef6f4408f1ea5a6f94ce4d4052830c4326ab85ebc04f983f01b3da407
       - name: Build mimalloc object
         run: |
           set -euxo pipefail
@@ -206,7 +206,7 @@ jobs:
     runs-on: windows-${{ matrix.windows-version }}
     env:
       SWIFT_VERSION: development
-      SWIFT_BUILD: DEVELOPMENT-SNAPSHOT-2026-03-16-a
+      SWIFT_BUILD: DEVELOPMENT-SNAPSHOT-2026-05-07-a
     strategy:
       fail-fast: false
       matrix:

.github/workflows/test.yml

@@ -13,9 +13,9 @@ env:
 
 jobs:
   spm_linux:
-    name: SPM, Linux, Swift 6.2
+    name: SPM, Linux, Swift 6.3
     runs-on: ubuntu-24.04
-    container: swift:6.2-noble
+    container: swift:6.3-noble
     steps:
       - &checkout-step
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
@@ -46,7 +46,7 @@ jobs:
           - macOS: '15'
             xcode: '16.4'
           - macOS: '26'
-            xcode: '26.4'
+            xcode: '26.5'
     env:
       DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app
     steps: