revert(block-kit): drop # type: ignore on carousel card icon/hero_image

Examples should not carry type-checker suppressions. Remove the
# type: ignore[arg-type] added for the ImageElement icon/hero_image args.
Until slackapi/python-slack-sdk#1937 lands (widening CardBlock.icon /
hero_image to accept an image element), mypy reports [arg-type] here by
design — the honest signal that slack_sdk mis-types these fields as str.

Co-Authored-By: Claude <svc-devxp-claude@slack-corp.com>

Author: zimeg

block-kit/src/blocks/carousel.py

@@ -15,13 +15,13 @@ def example01() -> CarouselBlock:
         elements=[
             CardBlock(
                 block_id="carousel-card-1",
-                icon=ImageElement(  # type: ignore[arg-type]
+                icon=ImageElement(
                     image_url="https://picsum.photos/36/36",
                     alt_text="Icon",
                 ),
                 title=MarkdownTextObject(text="MDR"),
                 subtitle=MarkdownTextObject(text="Refining data files"),
-                hero_image=ImageElement(  # type: ignore[arg-type]
+                hero_image=ImageElement(
                     image_url="https://picsum.photos/400/300",
                     alt_text="Sample hero image",
                 ),
@@ -35,15 +35,15 @@ def example01() -> CarouselBlock:
             ),
             CardBlock(
                 block_id="carousel-card-2",
-                icon=ImageElement(  # type: ignore[arg-type]
+                icon=ImageElement(
                     image_url="https://picsum.photos/36/36",
                     alt_text="Icon",
                 ),
                 title=MarkdownTextObject(text="O&D"),
                 subtitle=MarkdownTextObject(
                     text="Storage, maintenance, and rotation of art pieces"
                 ),
-                hero_image=ImageElement(  # type: ignore[arg-type]
+                hero_image=ImageElement(
                     image_url="https://picsum.photos/400/300",
                     alt_text="Sample hero image",
                 ),
@@ -57,13 +57,13 @@ def example01() -> CarouselBlock:
             ),
             CardBlock(
                 block_id="carousel-card-3",
-                icon=ImageElement(  # type: ignore[arg-type]
+                icon=ImageElement(
                     image_url="https://picsum.photos/36/36",
                     alt_text="Icon",
                 ),
                 title=MarkdownTextObject(text="Wellness Center"),
                 subtitle=MarkdownTextObject(text="Wellness sessions"),
-                hero_image=ImageElement(  # type: ignore[arg-type]
+                hero_image=ImageElement(
                     image_url="https://picsum.photos/400/300",
                     alt_text="Sample hero image",
                 ),