The existing `bump-formula-pr` regexes expect a `url` string to only
be followed by a newline. However, `url` also accepts a `specs` hash,
which can appear after the `url` string. For example:
```
url "https://www.example.com/1.2.3.tar.gz", using: :homebrew_curl
```
This commit modifies the regexes to capture anything after the `url`
string and before the newline. This works for the aforementioned
example, where the trailing hash is on the same line, but it won't
work if the hash appears on a subsequent line. For example:
```
url "https://www.example.com/1.2.3.tar.gz",
using: :homebrew_curl
```
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