chore: bump chromium to 121.0.6104.0 (main) (#40418)

* chore: bump chromium in DEPS to 121.0.6101.0

* chore: update patches

* Explictly use python3 to check patch diff

* chore: bump chromium in DEPS to 121.0.6102.0

* chore: update patches

* 4995136: [extensions] Enable Extension Mojo messaging

4995136

* Bind the components interfaces to a RenderFrame

4985961
Also:
3986427: Create RendererHost mojom interface for Extensions | 3986427

* 4997024: Enum modernisation for resources_private.idl

4997024

* 4997025: Enum modernisation for scripting.idl

4997025

* chore: bump chromium in DEPS to 121.0.6103.0

* chore: update patches

* chore: bump chromium in DEPS to 121.0.6104.0

* chore: update patches

---------

Co-authored-by: electron-roller[bot] <84116207+electron-roller[bot]@users.noreply.github.com>
Co-authored-by: John Kleinschmidt <jkleinsc@electronjs.org>
Co-authored-by: PatchUp <73610968+patchup[bot]@users.noreply.github.com>

patches/chromium/load_v8_snapshot_in_browser_process.patch

@@ -9,10 +9,10 @@ but due to the nature of electron, we need to load the v8 snapshot
 in the browser process.
 
 diff --git a/content/app/content_main_runner_impl.cc b/content/app/content_main_runner_impl.cc
-index 965b07bc438473baacd3c1309e012e68a3b245d9..c5b68291a9632e8820721de5513ed682c65a175c 100644
+index b3003b5d816464b77533ac3c235a79012b2c51e3..5f25a4b71b7b2a9cf9d91b655d9976b5a32b1c9e 100644
 --- a/content/app/content_main_runner_impl.cc
 +++ b/content/app/content_main_runner_impl.cc
-@@ -275,11 +275,8 @@ void LoadV8SnapshotFile(const base::CommandLine& command_line) {
+@@ -274,11 +274,8 @@ void LoadV8SnapshotFile(const base::CommandLine& command_line) {
  
  bool ShouldLoadV8Snapshot(const base::CommandLine& command_line,
                            const std::string& process_type) {