Merge pull request #33385 from drodil/auth_mem_leaks

fix(auth): memory leaks

.changeset/thirty-steaks-serve.md

@@ -0,0 +1,9 @@
+---
+'@backstage/plugin-auth-backend-module-aws-alb-provider': patch
+'@backstage/plugin-auth-backend': patch
+---
+
+Fixed a foreign key constraint violation when issuing refresh tokens for CIMD clients, and
+prevented a failed refresh token issuance from failing the entire token exchange.
+Fixed AWS ALB auth provider incorrectly returning HTTP 500 instead of 401 for JWT validation failures,
+which caused retry loops and memory pressure under load.