Update canvas dependency version to 3.2.0

[paladox]

This adds support for newer nodejs versions.

Also drops support for nodejs versions less than 18.

[paladox]

I'm not sure if test failure is due to this change but it's failing with:

FAIL nodejs-tests/compareImages.test.js (12.284 s)
  ● compareImages › Buffers data
    thrown: "Exceeded timeout of 5000 ms for a test.
    Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."
       7 |
       8 | describe("compareImages", () => {
    >  9 |     test("Buffers data", async () => {
         |     ^
      10 |         const readImg1 = readFile("./demoassets/People.jpg");
      11 |         const readImg2 = readFile("./demoassets/People2.jpg");
      12 |         const readComparison = readFile("./nodejs-tests/assets/PeopleComparedToPeople2.png");
      at test (nodejs-tests/compareImages.test.js:9:5)
      at Object.describe (nodejs-tests/compareImages.test.js:8:1)
  ● compareImages › throws when failed
    expect(received).rejects.toMatch(expected)
    Expected substring: "Failed to load image 'bogus data'. Error: ENOENT, No such file or directory 'bogus data'"
    Received string:    "Failed to load image 'bogus data'. Error: No such file or directory"
      35 |     test("throws when failed", async () => {
      36 |         const promise = compareImages(fs.readFileSync("./demoassets/People.jpg"), "bogus data");
    > 37 |         await expect(promise).rejects.toMatch("Failed to load image 'bogus data'. Error: ENOENT, No such file or directory 'bogus data'");
         |                                       ^
      38 |     });
      39 |
      40 |     test("throws when invalid image format", async () => {
      at Object.toMatch (node_modules/expect/build/index.js:210:22)
      at Object.toMatch (nodejs-tests/compareImages.test.js:37:39)
PASS nodejs-tests/errorPixelTransform.test.js
FAIL nodejs-tests/resemble.test.js (14.357 s)
  ● resemble › file not found
    expect(received).toEqual(expected) // deep equality
    Expected: "Failed to load image '../demoassets/People.jpg'. Error: ENOENT, No such file or directory '../demoassets/People.jpg'"
    Received: "Failed to load image '../demoassets/People.jpg'. Error: No such file or directory"
      58 |                 .compareTo("../demoassets/404-image.jpg")
      59 |                 .onComplete((data) => {
    > 60 |                     expect(data.error).toEqual(
         |                                        ^
      61 |                         "Failed to load image '../demoassets/People.jpg'. Error: ENOENT, No such file or directory '../demoassets/People.jpg'"
      62 |                     );
      63 |                     resolve();
      at Array.toEqual (nodejs-tests/resemble.test.js:60:40)
      at triggerDataUpdate (resemble.js:224:43)
      at triggerDataUpdate (resemble.js:806:25)
      at callback (resemble.js:324:17)
      at setSource (node_modules/canvas/lib/image.js:91:13)
      at Image.set (node_modules/canvas/lib/image.js:62:9)
      at loadImageData (resemble.js:334:32)
      at loadImageData (resemble.js:831:13)
      at compare (resemble.js:958:25)
      at Object.wrapper [as onComplete] (resemble.js:961:21)
      at onComplete (nodejs-tests/resemble.test.js:59:18)
      at Object.<anonymous> (nodejs-tests/resemble.test.js:56:9)
PASS nodejs-tests/ignore.test.js (14.923 s)
Test Suites: 2 failed, 2 passed, 4 total