fix: 尝试修复release冲突问题，修正cls文件版本号

.github/workflows/build.yml

 name: Build LaTeX document
-on: [push, pull_request]
+on: 
+  push:
+    tags-ignore:
+      - v*
+  pull_request:
+  
 jobs:
   build_latex:
     runs-on: ubuntu-latest

.github/workflows/release.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: "ubuntu-latest"
     strategy:
       matrix:
-        latex: [xelatex, lualatex]
+        latex: [xelatex]
     steps:
       - name: Set up Git repository
         uses: actions/checkout@v2
@@ -27,6 +27,6 @@ jobs:
       - uses: "marvinpinto/action-automatic-releases@latest"
         with:
           repo_token: "${{ secrets.GITHUB_TOKEN }}"
-          prerelease: true
+          prerelease: false
           files: |
             njuthesis.pdf

njuthesis.cls

 \NeedsTeXFormat{LaTeX2e}
-\ProvidesExplClass{njuthesis}{2021-09-04}{0.5.0}{NJU Thesis Undergraduate LaTeX Template}
+\ProvidesExplClass{njuthesis}{2021-09-04}{0.6.0}{NJU Thesis Undergraduate LaTeX Template}
 
 % 通过类传递参数
 \RequirePackage{l3keys2e}