MINOR: Add code signing key for Igor (#600)

diff --git a/KEYS b/KEYS
index 8d1f0ce..3961ea8 100644
--- a/KEYS
+++ b/KEYS
@@ -2088,3 +2088,22 @@
 YCIpXE+xOu2GmumPwM4B
 =X7J9
 -----END PGP PUBLIC KEY BLOCK-----
+pub   ed25519 2024-05-02 [SC]
+      4687E2BC1319B57B321D6F0E39AB5531A7FCB08E
+uid           [ultimate] Igor Soarez (CODE SIGNING KEY) <soarez@apache.org>
+sig 3        39AB5531A7FCB08E 2024-05-02  [self-signature]
+sub   cv25519 2024-05-02 [E]
+sig          39AB5531A7FCB08E 2024-05-02  [self-signature]
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+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=
+=qi+y
+-----END PGP PUBLIC KEY BLOCK-----