chore(ci): revert pnpm migration; hosted runner does not provides pnpm by default:

https://github.com/actions/runner-images/blob/main/images/ubuntu/Ubuntu2204-Readme.md
----

Revert "perf(ci): use pnpx instead of npx"

This reverts commit f66fcad.

Revert "perf(ci): use pnpx instead of npx, part 2"

This reverts commit 9f12065.

Revert "perf(ci): use pnpx instead of npx, part 3"

This reverts commit 1082622.

Author: KisaragiEffective

.github/workflows/validate-renovate.yml

@@ -23,12 +23,12 @@ jobs:
           ver="37.291.0"
           # pinned on exact version
           package="renovate@=$ver"
-          echo "npx: $(pnpm --version)"
+          echo "npx: $(npx --version)"
           echo "installing: $package..."
           export H="$(mktemp)"
           echo '{' >> "$H"
           # let's do main part, but avoid pipefail
-          (pnpx -c --package "$package" dlx renovate-config-validator --strict || true)\
+          (npx --yes --package "$package" -- renovate-config-validator --strict || true)\
             | ruby -e 'File.open(ENV[?H], ?a) {|r| while gets; puts $_; $> = r if $_.strip == "WARN: Config migration necessary" ;end; }'
           echo '}' >> "$H"