Add Xcode 26.4 (#10133)

* Add Xcode 26.4

Also update Xcode 26.3 info

* Update references to use Xcode 26.4

Author: anthony-j-castro

docs/guides/modules/ROOT/partials/execution-resources/xcode-silicon-vm.adoc

@@ -9,13 +9,21 @@
 | VM Software Manifest
 | Release Notes
 
+| `26.4.0`
+| Xcode 26.4.0 (17E192)
+| 26.3.1
+a| `m4pro.medium` +
+   `m4pro.large`
+| link:https://circle-macos-docs.s3.amazonaws.com/image-manifest/v17216/manifest.txt[Installed software]
+| link:https://circleci.com/changelog/xcode-26-4-0-available/[Release Notes]
+
 | `26.3.0`
-| Xcode 26.3.0 (17C528)
+| Xcode 26.3.0 (17C529)
 | 15.6
 a| `m4pro.medium` +
    `m4pro.large`
-| link:https://circle-macos-docs.s3.amazonaws.com/image-manifest/v16221/manifest.txt[Installed software]
-| link:https://circleci.com/changelog/xcode-26-3-0-rc-2-available[Release Notes]
+| link:https://circle-macos-docs.s3.amazonaws.com/image-manifest/v16344/manifest.txt[Installed software]
+| link:https://circleci.com/changelog/xcode-26-3-0-available/[Release Notes]
 
 | `26.2.0`
 | Xcode 26.2.0 (17C52)

docs/guides/modules/execution-managed/pages/hello-world-macos.adoc

@@ -56,7 +56,7 @@ version: 2.1
 jobs: # a basic unit of work in a run
   test: # your job name
     macos:
-      xcode: 26.3.0 # indicate your selected version of Xcode
+      xcode: 26.4.0 # indicate your selected version of Xcode
     resource_class: m4pro.medium # specify a resource class (e.g. m4pro.medium or m4pro.large)
     steps: # a series of commands to run
       - checkout  # pull down code from your version control system.
@@ -66,7 +66,7 @@ jobs: # a basic unit of work in a run
 
   build:
     macos:
-      xcode: 26.3.0 # indicate your selected version of Xcode
+      xcode: 26.4.0 # indicate your selected version of Xcode
     resource_class: m4pro.medium # specify a resource class (e.g. m4pro.medium or m4pro.large)
     steps:
       - checkout

docs/guides/modules/execution-managed/pages/using-macos.adoc

@@ -12,12 +12,12 @@ You can use the macOS execution environment to run your xref:orchestrate:jobs-st
 jobs:
   build:
     macos:
-      xcode: 26.3.0
+      xcode: 26.4.0
     resource_class: m4pro.medium
 
     steps:
       # Commands will execute in macOS container
-      # with Xcode 26.3.0 installed
+      # with Xcode 26.4.0 installed
       - run: xcodebuild -version
 ----
 
@@ -39,7 +39,7 @@ include::ROOT:partial$execution-resources/macos-resource-table.adoc[]
 jobs:
   build:
     macos:
-      xcode: 26.3.0
+      xcode: 26.4.0
     resource_class: m4pro.medium
 ----
 
@@ -218,7 +218,7 @@ version: 2.1
 jobs:
   build-and-test:
     macos:
-      xcode: 26.3.0
+      xcode: 26.4.0
     environment:
       HOMEBREW_NO_AUTO_UPDATE: 1
     steps:
@@ -257,7 +257,7 @@ version: 2.1
 jobs:
   build-and-test:
     macos:
-      xcode: 26.3.0
+      xcode: 26.4.0
     environment:
       FL_OUTPUT_DIR: output
 

docs/guides/modules/getting-started/pages/hello-world.adoc

@@ -79,7 +79,7 @@ version: 2.1
 jobs:
   hello-job:
     macos:
-      xcode: 26.3.0
+      xcode: 26.4.0
     resource_class: m4pro.medium
     steps:
       - checkout # check out the code in the project directory

docs/guides/modules/optimize/pages/optimizations.adoc

@@ -119,7 +119,7 @@ macOS::
 jobs:
   build:
     macos:
-      xcode: 26.3.0
+      xcode: 26.4.0
     resource_class: m4pro.medium
     steps:
     #  ...  other config

docs/reference/modules/ROOT/pages/configuration-reference.adoc

@@ -1082,14 +1082,14 @@ CircleCI supports running jobs on link:https://developer.apple.com/macos/[macOS]
 |===
 --
 
-*Example:* Use a macOS virtual machine with Xcode version 26.3.0:
+*Example:* Use a macOS virtual machine with Xcode version 26.4.0:
 
 [,yaml]
 ----
 jobs:
   build:
     macos:
-      xcode: 26.3.0
+      xcode: 26.4.0
 ----
 
 '''
@@ -1244,7 +1244,7 @@ include::guides:ROOT:partial$execution-resources/macos-resource-table.adoc[]
 jobs:
   build:
     macos:
-      xcode: 26.3.0
+      xcode: 26.4.0
     resource_class: m4pro.medium
     steps:
       ... // other config