GHSA-995v-fvrw-c78m: opentelemetry-go's Schema ParseFile leaks file descriptors on each parse

OpenTelemetry Go's `ParseFile` function has a file descriptor leak (a reference to an open file that is never closed), where each call to parse a schema file leaves the file open in memory. In a long-running application that repeatedly parses schema files, these open files can accumulate until the process runs out of available file descriptors and crashes, causing a denial of service (unavailability).