Add librpm.so.9 to the names dlopen searches

Fedora 31 and 32 use librpm.so.9, but Auditbeat's system/package dataset doesn't try to load
this version of the library.

Fixes elastic#19253

CHANGELOG.next.asciidoc

@@ -144,6 +144,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - system/package: Fix an error that can occur while trying to persist package metadata. {issue}18536[18536] {pull}18887[18887]
 - system/socket: Fix dataset using 100% CPU and becoming unresponsive in some scenarios. {pull}19033[19033]
 - system/socket: Fixed tracking of long-running connections. {pull}19033[19033]
+- system/package: Fix librpm loading on Fedora 31/32. {pull}NNNN[NNNN]
 
 *Filebeat*
 

x-pack/auditbeat/module/system/package/rpm_linux.go

@@ -207,11 +207,13 @@ func (lib *librpm) close() error {
 func openLibrpm() (*librpm, error) {
 	var librpmNames = []string{
 		"librpm.so",   // with rpm-devel installed
-		"librpm.so.8", // Fedora 29
+		"librpm.so.9", // Fedora 31/32
+		"librpm.so.8", // Fedora 29/30
 		"librpm.so.3", // CentOS 7
 		"librpm.so.1", // CentOS 6
 
 		// Following for completeness, but not explicitly tested
+		"librpm.so.10",
 		"librpm.so.7",
 		"librpm.so.6",
 		"librpm.so.5",