Try removing 'download Dart and iOS deps' steps

Author: jmagman

.ci/targets/ios_build_all_packages.yaml

@@ -2,10 +2,6 @@ tasks:
   - name: prepare tool
     script: .ci/scripts/prepare_tool.sh
     infra_step: true # Note infra steps failing prevents "always" from running.
-  - name: download Dart and iOS deps
-    script: .ci/scripts/tool_runner.sh
-    args: ["fetch-deps", "--ios", "--supporting-target-platforms-only"]
-    infra_step: true
   - name: create all_packages app
     script: .ci/scripts/create_all_packages_app.sh
     infra_step: true # Note infra steps failing prevents "always" from running.

.ci/targets/macos_build_all_packages.yaml

@@ -2,10 +2,6 @@ tasks:
   - name: prepare tool
     script: .ci/scripts/prepare_tool.sh
     infra_step: true # Note infra steps failing prevents "always" from running.
-  - name: download Dart and macOS deps
-    script: .ci/scripts/tool_runner.sh
-    args: ["fetch-deps", "--macos", "--supporting-target-platforms-only"]
-    infra_step: true
   - name: create all_packages app
     script: .ci/scripts/create_all_packages_app.sh
     infra_step: true # Note infra steps failing prevents "always" from running.