Bumps test image to 8.2.1-pre

Signed-off-by: Elena Kolevska <[email protected]>

Author: elena-kolevska

.github/actions/run-tests/action.yml

@@ -25,7 +25,7 @@ runs:
         
         # Mapping of redis version to redis testing containers
         declare -A redis_version_mapping=(
-          ["8.2.x"]="8.2"
+          ["8.2.x"]="8.2.1-pre"
           ["8.0.x"]="8.0.2"
           ["7.4.x"]="rs-7.4.0-v5"
           ["7.2.x"]="rs-7.2.0-v17"