chore(deps): bump @socketsecurity/lib to 5.20.1 in catalog

Also strips the obsolete `resolutionMode: highest` (default is already
highest in pnpm 11).

Author: jdalton

pnpm-lock.yaml

@@ -1,5 +1,3 @@
-resolutionMode: highest
-
 packages:
   - packages/npm/*
   - perf/*
@@ -29,7 +27,7 @@ catalog:
   '@npmcli/package-json': 7.0.0
   '@npmcli/promise-spawn': 8.0.3
   '@socketregistry/packageurl-js': 1.4.2
-  '@socketsecurity/lib': 5.19.1
+  '@socketsecurity/lib': 5.20.1
   '@types/fs-extra': 11.0.4
   '@types/node': 24.9.2
   '@types/normalize-package-data': 2.4.4
@@ -164,4 +162,5 @@ overrides:
 patchedDependencies:
   brace-expansion@2.0.2: patches/brace-expansion@2.0.2.patch
   minimatch@9.0.5: patches/minimatch@9.0.5.patch
+resolutionMode: highest
 trustPolicy: no-downgrade