Bump bpf-tools to v1.21 (#22083)

(cherry picked from commit 7cc6262b5a)

Co-authored-by: Dmitri Makarov <dmakarov@alumni.stanford.edu>

programs/bpf/tests/programs.rs

@@ -1399,7 +1399,7 @@ fn assert_instruction_count() {
             ("solana_bpf_rust_param_passing", 146),
             ("solana_bpf_rust_rand", 488),
             ("solana_bpf_rust_sanity", 8455),
-            ("solana_bpf_rust_secp256k1_recover", 25216),
+            ("solana_bpf_rust_secp256k1_recover", 25624),
             ("solana_bpf_rust_sha", 30692),
         ]);
     }