workflows: update Klipper's repo location

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>

.github/workflows/publish_assets.yaml

@@ -19,7 +19,7 @@ jobs:
       uses: actions/checkout@v2
       with:
         fetch-depth: 0
-        repository: KevinOConnor/klipper
+        repository: Klipper3d/klipper
         path: klipper
 
     - name: Build Beta Assets

scripts/build_release.py

@@ -33,7 +33,7 @@ GIT_LOG_FMT = \
     "sha:%H%x1Dauthor:%an%x1Ddate:%ct%x1Dsubject:%s%x1Dmessage:%b%x1E"
 OWNER_REPOS = {
     'moonraker': "arksine/moonraker",
-    'klippy': "kevinoconnor/klipper"
+    'klippy': "klipper3d/klipper"
 }
 INSTALL_SCRIPTS = {
     'klippy': {