Update GH Actions wrt master->3.x renaming

Author: cowtowncoder

.github/workflows/dep_build_v3.yml

@@ -21,7 +21,7 @@ jobs:
     steps:
     - uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
       with:
-        ref: master
+        ref: 3.x
     - name: Set up JDK
       uses: actions/setup-java@99b8673ff64fbf99d8d325f52d9a5bdedb8483e9 # v4.2.1
       with:

.github/workflows/main.yml

@@ -2,11 +2,13 @@ name: Build and Run Tests
 on:
   push:
     branches:
-    - master
+    - 3.x
+    - 2.x
     - "2.19"
   pull_request:
     branches:
-    - master
+    - 3.x
+    - 2.x
     - "2.19"
   # Also run once per day anyway, at 10:00 UTC (18:00 PT)
   schedule: