ci: spelling check

[liweijie0812]

➤ typos
error: `backgound` should be `background`
  --> ./lib/properties/backgroundColor.js:25:26
   |
25 |       this._setProperty("backgound-color", v);
   |                          ^^^^^^^^^
   |
error: `backgound` should be `background`
  --> ./lib/properties/backgroundRepeat.js:22:26
   |
22 |       this._setProperty("backgound-repeat", v);
   |                          ^^^^^^^^^
   |
error: `elipse` should be `ellipse`, `eclipse`
  --> ./test/CSSStyleDeclaration.test.js:272:19
    |
272 |     style.clip = "elipse(5px, 10px)";
    |                   ^^^^^^
    |
error: `Fo` should be `Of`, `For`, `Do`, `Go`, `To`
  --> ./test/CSSStyleDeclaration.test.js:726:24
    |
726 |     style.setProperty("FoNt-SiZe", "12px");
    |                        ^^
    |
error: `backgound` should be `background`
  --> ./lib/properties/backgroundAttachment.js:22:26
   |
22 |       this._setProperty("backgound-attachemnt", v);
   |                          ^^^^^^^^^
   |
error: `attachemnt` should be `attachment`
  --> ./lib/properties/backgroundAttachment.js:22:36
   |
22 |       this._setProperty("backgound-attachemnt", v);
   |                                    ^^^^^^^^^^
   |
error: `ba` should be `by`, `be`
  --> ./test/camelize.test.js:39:30
   |
39 |     const input = "--foo-Bar-baZ";
   |                              ^^
   |
error: `ba` should be `by`, `be`
  --> ./test/camelize.test.js:42:43
   |
42 |     assert.strictEqual(output, "--foo-Bar-baZ");
   |                                           ^^
   |
error: `backgound` should be `background`
  --> ./lib/properties/backgroundImage.js:21:26
   |
21 |       this._setProperty("backgound-image", v);
   |                          ^^^^^^^^^
   |
error: `backgound` should be `background`
  --> ./lib/properties/backgroundPosition.js:42:26
   |
42 |       this._setProperty("backgound-position", v);
   |                          ^^^^^^^^^
   |