chore(deps): drop python 3.8 support and bump diot to 0.3

Author: pwwang

.github/workflows/build.yml

@@ -9,7 +9,7 @@ jobs:
     if: "! contains(github.event.head_commit.message, 'wip')"
     strategy:
       matrix:
-        python-version: [3.8, 3.9, "3.10", "3.11"]
+        python-version: [3.9, "3.10", "3.11", "3.12"]
 
     steps:
       - uses: actions/checkout@v4
@@ -37,7 +37,7 @@ jobs:
         if: ${{ always() }}
       - name: Run codacy-coverage-reporter
         uses: codacy/codacy-coverage-reporter-action@master
-        if: matrix.python-version == 3.10
+        if: matrix.python-version == 3.12
         with:
           project-token: ${{ secrets.CODACY_PROJECT_TOKEN }}
           coverage-reports: .coverage.xml
@@ -48,7 +48,7 @@ jobs:
     if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
     strategy:
       matrix:
-        python-version: ["3.10"]
+        python-version: ["3.12"]
     steps:
       - uses: actions/checkout@v4
       - name: Setup Python # Set Python version

.github/workflows/docs.yml

@@ -8,7 +8,7 @@ jobs:
     if: "! contains(github.event.head_commit.message, 'wip')"
     strategy:
       matrix:
-        python-version: ["3.10"]
+        python-version: ["3.12"]
     steps:
       - uses: actions/checkout@v4
       - name: Setup Python # Set Python version
@@ -37,7 +37,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.10"]
+        python-version: ["3.12"]
     steps:
       - uses: actions/checkout@v4
         with: