[APM] Update APM package version to 8.1.0 (#126477) (#126513)

(cherry picked from commit 6634e14)

Co-authored-by: Cauê Marcondes <[email protected]>

x-pack/plugins/apm/common/fleet.ts

@@ -8,7 +8,7 @@ import semverParse from 'semver/functions/parse';
 
 export const POLICY_ELASTIC_AGENT_ON_CLOUD = 'policy-elastic-agent-on-cloud';
 
-export const SUPPORTED_APM_PACKAGE_VERSION = '8.0.0';
+export const SUPPORTED_APM_PACKAGE_VERSION = '8.1.0';
 
 export function isPrereleaseVersion(version: string) {
   return semverParse(version)?.prerelease?.length ?? 0 > 0;