chore(deps): Update stable-baselines3 requirement

Updates the requirements on [stable-baselines3](https://github.com/DLR-RM/stable-baselines3) to permit the latest version.
- [Release notes](https://github.com/DLR-RM/stable-baselines3/releases)
- [Commits](https://github.com/DLR-RM/stable-baselines3/compare/v2.8.0...v2.9.0)

---
updated-dependencies:
- dependency-name: stable-baselines3
  dependency-version: 2.9.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
   security:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v6
 
       - name: Run Bandit (Security Scan)
         uses: PyCQA/bandit-action@v1
@@ -25,7 +25,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-python@v6
         with:

.github/workflows/codacy.yml

@@ -36,7 +36,7 @@ jobs:
     steps:
       # Checkout the repository to the GitHub Actions runner
       - name: Checkout code
-        uses: actions/checkout@v7
+        uses: actions/checkout@v6
 
       # Execute Codacy Analysis CLI and generate a SARIF output with the security issues identified during the analysis
       - name: Run Codacy Analysis CLI

.github/workflows/conventional-commits.yml

@@ -46,7 +46,7 @@ jobs:
     name: Validate Commit Messages
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

.github/workflows/docs.yml

@@ -25,7 +25,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v7
+      uses: actions/checkout@v6
 
     - name: Set up Python
       uses: actions/setup-python@v6

.github/workflows/lint.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v7
+      uses: actions/checkout@v6
 
     - name: Set up Python
       uses: actions/setup-python@v6

.github/workflows/scheduled-tests.yml

@@ -19,7 +19,7 @@ jobs:
         python-version: ["3.10", "3.11"]
 
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-python@v6
         with:
@@ -49,7 +49,7 @@ jobs:
     name: Dependency Audit
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-python@v6
         with:

.github/workflows/security.yml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v7
+      uses: actions/checkout@v6
 
     - name: Set up Python
       uses: actions/setup-python@v6

requirements/rl.txt

@@ -8,7 +8,7 @@
 # Only install if you want to use full PPO/A2C/SAC training.
 
 # Core RL library
-stable-baselines3[extra]>=2.8.0
+stable-baselines3[extra]>=2.9.0
 
 # Gymnasium environment (OpenAI Gym successor)
 gymnasium>=0.29.1