Remove redundant line break in isc-2025.md

Removed extra line break before Keynote speakers section.

Author: rrrutledge

content/en/events/isc-2025.md

@@ -72,7 +72,6 @@ This year’s Summit brings together the very best InnerSourcerers from across t
 With in-person presentations in Yokohama, Berlin, and New York, alongside contributions from online speakers worldwide, this is a truly global gathering. Together, our speakers will share their expertise, stories, and visions for the future of InnerSource—making this 10-year anniversary Summit one to remember.
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 ### Keynote speakers
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