ci(actions): Update to Py3.13 on ubuntu

Closes #1047

.github/workflows/dev_release_esptool_pypi.yml

@@ -16,10 +16,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@master
-    - name: Set up Python 3.8
+    - name: Set up Python 3.13
       uses: actions/setup-python@master
       with:
-        python-version: '3.8'
+        python-version: '3.13'
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip

.github/workflows/release_esptool_pypi.yml

@@ -13,10 +13,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@master
-    - name: Set up Python 3.7
+    - name: Set up Python 3.13
       uses: actions/setup-python@master
       with:
-        python-version: '3.7'
+        python-version: '3.13'
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip

.github/workflows/test_esptool.yml

@@ -4,7 +4,7 @@ on: [push, pull_request]
 
 jobs:
   test_esptool:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04  # 22.04 is the last version with Python 3.7
 
     strategy:
       matrix:
@@ -63,7 +63,7 @@ jobs:
             git diff --exit-code
 
   lint_esptool:
-      runs-on: ubuntu-latest
+      runs-on: ubuntu-22.04  # 22.04 is the last version with Python 3.7
       steps:
         - name: Checkout
           uses: actions/checkout@master