Cap remote changelog body at 1 MiB in FetchAndParse#3
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FetchAndParsepreviously read the entire HTTP response into memory withio.ReadAll(resp.Body). A repository owner could serve an arbitrarily large changelog and cause the caller to allocate unbounded memory.This wraps the body in
io.LimitReadercapped at 1 MiB, matching the existing size heuristic inFindChangelog. Adds a test that serves a 2 MiB body viahttptest.NewServerand verifies the parser receives at most 1 MiB.