Set target to v2020 for OTA upgrade tests

Use separate commit for changing the target to avoid
potential merging issues in future.

Signed-off-by: Denis Pynkin <denis.pynkin@collabora.com>

test-cases/aum-ota-api.yaml

@@ -21,7 +21,7 @@ metadata:
 install:
   git-repos:
     - url: https://gitlab.apertis.org/tests/aum-offline-upgrade.git
-      branch: apertis/v2021dev2
+      branch: apertis/v2020
 
 run:
   steps:

test-cases/aum-ota-auto.yaml

@@ -21,7 +21,7 @@ metadata:
 install:
   git-repos:
     - url: https://gitlab.apertis.org/tests/aum-offline-upgrade.git
-      branch: apertis/v2021dev2
+      branch: apertis/v2020
 
 run:
   steps:

test-cases/aum-ota-out-of-space.yaml

@@ -21,7 +21,7 @@ metadata:
 install:
   git-repos:
     - url: https://gitlab.apertis.org/tests/aum-offline-upgrade.git
-      branch: apertis/v2021dev2
+      branch: apertis/v2020
 
 run:
   steps:

test-cases/aum-ota-rollback-blacklist.yaml

@@ -21,7 +21,7 @@ metadata:
 install:
   git-repos:
     - url: https://gitlab.apertis.org/tests/aum-offline-upgrade.git
-      branch: apertis/v2021dev2
+      branch: apertis/v2020
 
 run:
   steps:

test-cases/aum-ota-signed.yaml

@@ -21,7 +21,7 @@ metadata:
 install:
   git-repos:
     - url: https://gitlab.apertis.org/tests/aum-offline-upgrade.git
-      branch: apertis/v2021dev2
+      branch: apertis/v2020
 
 run:
   steps: