Prepare for merging release/v5.3 into master

Author: me-no-dev

Diff for: .github/workflows/cron.yml

@@ -36,5 +36,5 @@ jobs:
             lib_builder_branch: "release/v5.1"
             targets: "esp32,esp32s2,esp32s3,esp32c3,esp32c6,esp32h2"
           - idf_branch: "release/v5.3"
-            lib_builder_branch: "release/v5.3"
+            lib_builder_branch: "master"
             targets: "esp32,esp32s2,esp32s3,esp32c3,esp32c6,esp32h2,esp32p4"

Diff for: tools/config.sh

@@ -10,7 +10,7 @@ if [ -z $IDF_BRANCH ]; then
 fi
 
 if [ -z $AR_PR_TARGET_BRANCH ]; then
-    AR_PR_TARGET_BRANCH="release/v3.1.x"
+    AR_PR_TARGET_BRANCH="master"
 fi
 
 if [ -z $IDF_TARGET ]; then