update homebrew formula task can use golang image instead of debian

pipelines/shared-tasks/update-homebrew-formula/task.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-# Copyright 2020-2024 the Pinniped contributors. All Rights Reserved.
+# Copyright 2020-2025 the Pinniped contributors. All Rights Reserved.
 # SPDX-License-Identifier: Apache-2.0
 
 set -xeuo pipefail
@@ -27,8 +27,7 @@ if [[ "$current_revision" != "$new_revision" ]]; then
     > homebrew-pinniped-out/pinniped-cli.rb
 
   cd homebrew-pinniped-out
-  apt update >/dev/null
-  apt install git -y >/dev/null
+
   git config user.email "pinniped-ci-bot@users.noreply.github.com"
   git config user.name "Pinny"
   git commit -a -m "pinniped-cli.rb: update to $new_version"

pipelines/shared-tasks/update-homebrew-formula/task.yml

@@ -1,4 +1,4 @@
-# Copyright 2020-2024 the Pinniped contributors. All Rights Reserved.
+# Copyright 2020-2025 the Pinniped contributors. All Rights Reserved.
 # SPDX-License-Identifier: Apache-2.0
 
 ---
@@ -6,8 +6,8 @@ platform: linux
 image_resource:
   type: registry-image
   source:
-    repository: debian
-    tag: 10.8
+    repository: golang
+    tag: latest
 inputs:
   - name: pinniped-ci
   - name: github-release