fix(std/encoding/toml): could not parse strings with apostrophes/semicolons

[uki00a]

This PR fixes #6776.

Cause

This bug is caused by a regular expression used to delete TOML comments.
Before this fix, TOML comments were stripped down by the following code:

    const m = /(?:\'|\[|{|\").*(?:\'|\]|\"|})\s*[^#]/g.exec(dataString);
    if (m) {
      dataString = m[0].trim();
    }

However, this regular expression does not properly handle strings containing apostrophes/semicolons:

/(?:\'|\[|{|\").*(?:\'|\]|\"|})\s*[^#]/g.exec(`"What if it's not?"`); // => [ `"What if it's` ]

/(?:\'|\[|{|\").*(?:\'|\]|\"|})\s*[^#]/g.exec(`"const message = 'hello world';"`); // => [ `"const message = 'hello world';` ]

[ry]

LGTM - thanks!