Fix spurious deeper nesting in a lazy blockquote continuation

[spokodev]

Problem

In a nested blockquote, a paragraph line that lazily continues and is then
followed by a line restating the > markers is parsed into an extra, spurious
blockquote level (and a split paragraph) instead of continuing the same
paragraph.

Input:

> > a
b
> > c

marked (before this PR):

<blockquote>
<blockquote>
<p>a
b</p>
<blockquote>
<p>c</p>
</blockquote>
</blockquote>
</blockquote>

Expected — identical output from both commonmark 0.31.2 and
micromark + micromark-extension-gfm:

<blockquote>
<blockquote>
<p>a
b
c</p>
</blockquote>
</blockquote>

> > a\nb\n> > > c shows the same off-by-one-level (4 blockquotes in marked vs
the correct 3). Plain lazy nesting without a restated marker
(> > > foo\nbar, CommonMark example 250) is unaffected, which is why no
existing spec caught it.

Root cause

The nested-blockquote continuation branch re-lexes the inner blockquote from
oldToken.raw + '\n' + lines.join('\n'). oldToken.raw already had one >
marker stripped for the inner frame, but the appended continuation lines still
carry the outer markers, so a restated > > keeps one surplus > when recursed
and is read as a fresh deeper blockquote that interrupts the open paragraph. The
single-level path works only because the marker is stripped there via
blockquoteSetextReplace2; this branch bypassed that strip.

Fix

Strip one > marker from the continuation lines (same blockquoteSetextReplace2
the normal path uses) so they align with the inner frame, and rebuild raw from
the actual consumed source. Deeper markers (> > >) simply recurse one further
level, which is correct.

Test

Added test/specs/new/blockquote_nested_lazy_continuation (.md/.html).
Fails on master (2 failing spec cases), passes with the fix. Full suite green:
test:specs 1769 pass / 0 fail, test:unit 188 pass / 0 fail.

Reference: CommonMark 0.31.2 §6.3 (block quotes — laziness): a line beginning
with the blockquote's own markers followed by paragraph text continues that
paragraph, not a new deeper quote.

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[UziTech]

Nice catch! 💯