Bump Dependencies

[github-actions]

> ungit@1.5.18 bumpdependencies
> ncu --upgrade --reject bootstrap

Upgrading /home/runner/work/ungit/ungit/package.json

 electron                ~13.1.7  →  ~15.0.0     
 electron-packager       ~15.3.0  →  ~15.4.0     
 eslint                  ~7.31.0  →  ~7.32.0     
 eslint-plugin-prettier   ~3.4.0  →   ~4.0.0     
 mocha                    ~9.0.2  →   ~9.1.1     
 npm-check-updates       ~11.8.3  →  ~11.8.5     
 prettier                 ~2.3.2  →   ~2.4.1     
 puppeteer               ~10.1.0  →  ~10.4.0     
 supertest                ~6.1.4  →   ~6.1.6     
 @primer/octicons        ~14.2.2  →  ~15.2.0     
 diff2html                ~3.4.7  →  ~3.4.11     
 getmac                  ~5.17.0  →  ~5.20.0     
 socket.io                ~4.1.3  →   ~4.2.0     
 yargs                   ~17.0.1  →  ~17.1.1     

Run npm install to install new versions.