build: bump actions/checkout to v7 and actions/setup-python to v7

Both are new majors since the last actions bump (#2377). Verified no
workflow uses pull_request_target/workflow_run (affected by
checkout v7's fork-checkout change) or setup-python's removed
pip-install input, so no other changes are needed.

Author: kikoso

.github/workflows/build.yml

@@ -32,7 +32,7 @@ jobs:
     timeout-minutes: 45
 
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
 
     - name: set up Java 21
       uses: actions/setup-java@v5
@@ -55,7 +55,7 @@ jobs:
     timeout-minutes: 45
 
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
 
     - name: set up Java 21
       uses: actions/setup-java@v5
@@ -74,7 +74,7 @@ jobs:
     timeout-minutes: 45
 
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
 
     - name: set up Java 21
       uses: actions/setup-java@v5
@@ -93,7 +93,7 @@ jobs:
     timeout-minutes: 45
 
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
 
     - name: set up Java 21
       uses: actions/setup-java@v5
@@ -118,7 +118,7 @@ jobs:
     timeout-minutes: 45
 
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
 
     - name: set up Java 21
       uses: actions/setup-java@v5
@@ -143,7 +143,7 @@ jobs:
       - build-Snippets
       - build-tutorials
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - name: set up Java 21
         uses: actions/setup-java@v5
         with:

.github/workflows/generate-v3.yml

@@ -25,7 +25,7 @@ jobs:
     timeout-minutes: 45
 
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
 
     - name: set up JDK 17
       uses: actions/setup-java@v5

.github/workflows/lint.yml

@@ -25,7 +25,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Set up JDK 17
         uses: actions/setup-java@v5
@@ -34,7 +34,7 @@ jobs:
           java-version: '21'
 
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7
         with:
           python-version: '3.x'