Update locker.yml

[RussKie]

• Bump the Locker action version
  Refer to Bump from Node 16 to Node 20 (Node 16 is out of support) microsoft/vscode-github-triage-actions#210

• Restrict the Locker action to dotnet org

[RussKie]

@wtgodbe there's no reason to spin builds for non-buildable changes like this. It's worth considering adding the exclusions to the ymls like the following:

 
 pr:
   branches:
     include:
     - main
     - release/*
     - feature/*
+  paths:
+    include:
+      - '*'
+    exclude:
+      - eng/Version.Details.xml
+      - .github/*
+      - docs/*
+      - CODE_OF_CONDUCT.md
+      - CONTRIBUTING.md
+      - README.md
+      - SECURITY.md
+      - LICENSE.TXT
+      - PATENTS.TXT
+      - THIRD-PARTY-NOTICES.TXT

I'm happy to send PRs, if you like.

[wtgodbe]

It's worth considering adding the exclusions to the ymls like the following:

@RussKie we tried that, but then we can't make aspnetcore-ci a required check, because the check doesn't run on those PRs. That means someone with admin perms has to force-merge any PRs on those files, which isn't really any better.