Update dependency grafana/flint to v0.20.0

Author: renovate[bot]

mise.toml

@@ -15,4 +15,4 @@ use_file_shell_for_executable_tasks = true
 # Pick the tasks you need from flint (https://github.com/grafana/flint)
 [tasks."lint:links"]
 description = "Check for broken links in changed files + all local links"
-file = "https://raw.githubusercontent.com/grafana/flint/df7b637ee421a491ca5c34b5be4122d8360f57c1/tasks/lint/links.sh" # v0.9.2
+file = "https://raw.githubusercontent.com/grafana/flint/d5e14011bca8fa206b4205d6def31ab8e2652c1c/tasks/lint/links.sh" # v0.20.0