Gitea: wrong pagination handling

[NateScarlet]

renovate/lib/platform/gitea/gitea-got-wrapper.ts

Lines 33 to 36 in 22f7607

	let nextPage = parseInt(url.query.page as string, 10) || 1 + 1;
	while (total && pc.length < total) {
	nextPage += 1;

when url.query.page is undefined , NaN || 1 + 1 is equivalent to NaN || 2, so nextPage starts from 3.

I have 26 repo, gitea default repo search page size is 10, so repo 21-26 got executed multiple times, and repo 11-20 will never got executed.

## Fix

let nextPage = parseInt(url.query.page || '1', 10)

then throw a error when nextPage is NaN.

seems modify url.query won't affect URL.format result

> u = URL.parse('https://git.example.com/api/v1/repos/search?uid=1', true)
Url {
  protocol: 'https:',
  slashes: true,
  auth: null,
  host: 'git.example.com',
  port: null,
  hostname: 'git.example.com',
  hash: null,
  search: '?uid=1',
  query: [Object: null prototype] { uid: '1' },
  pathname: '/api/v1/repos/search',
  path: '/api/v1/repos/search?uid=1',
  href: 'https://git.example.com/api/v1/repos/search?uid=1' }
> u.query.page = '1'
'1'
> URL.format(u)
'https://git.example.com/api/v1/repos/search?uid=1'

I have 26 repo, gitea default repo search page size is 10, so repo 1-10 got executed 3 times, and repo 11-26 will never got executed.