ansible: update gn on V8 build machines (#4066)

Roll forward the version of `gn` used to build V8.

Clean git checkout before building.

Refs: nodejs/node#57753 (comment)

Author: richardlau

ansible/roles/gn/tasks/main.yml

@@ -30,6 +30,14 @@
   ansible.builtin.set_fact:
     rebuild_gn: "{{ not gn_installed_version.stdout|default('') is search(gn_git.after[:7]) }}"
 
+- name: clean git checkout
+  ansible.builtin.shell: git clean -fdX
+  args:
+    chdir: "{{ gn_git_dir }}"
+  become: "{{ gn_user|default(omit)|bool }}"
+  become_user: "{{ gn_user|default(omit) }}"
+  when: rebuild_gn
+
 # Requires a C++17 compiler.
 - name: build gn
   ansible.builtin.shell: |

ansible/roles/gn/vars/main.yml

@@ -5,8 +5,8 @@ compiler: {
 }
 
 gn_select_compiler: "{{ compiler[os]|default(compiler[os|stripversion])|default('true') }}"
-gn_version: 88e8054
+gn_version: c0a46c5e8c316010baf1a0eb2d2ee5a86f73e4c2
 
 packages: {
   'rhel8': 'ninja-build,gcc-toolset-12'
-}
+}