Update dependency ruff to v0.15.21

Author: renovate[bot]

mise.toml

@@ -7,7 +7,7 @@ uv = "0.11.28"
 "npm:pyright" = "1.1.411"
 "pipx:shellcheck-gha" = "0.1.2"
 prettier = "3.9.5"
-ruff = "0.15.20"
+ruff = "0.15.21"
 shellcheck = "0.11.0"
 shfmt = "3.13.1"
 yq = "4.53.3"