ICU-22933 Update PGP key information for release signing

KEYS

@@ -1312,3 +1312,36 @@ buAuLkKKI35T4Lz2U41GMVIMZ7drlhbfDGugk1qT1cXJPZbPnHt+uFNUY0pTJaf3
 WapxBp2/lKhgsIE=
 =ZWln
 -----END PGP PUBLIC KEY BLOCK-----
+pub   ed25519 2024-08-19 [SC] [expires: 2027-08-19]
+      E52F07877A5805F9AF4AB0ACD46C5610D06E7001
+uid           [ultimate] ICU Release Robot <icu-robot@unicode.org>
+sig 3        D46C5610D06E7001 2024-08-19  ICU Release Robot <icu-robot@unicode.org>
+sig 3        9B432B27D1BA20D7 2024-10-01  Fredrik Roubert <fredrik@roubert.name>
+sub   cv25519 2024-08-19 [E] [expires: 2027-08-19]
+sig          D46C5610D06E7001 2024-08-19  ICU Release Robot <icu-robot@unicode.org>
+
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+NSbBQ0KK5M66AQCs7zuWUQQhptmeB2l7sP528nsFv4FJfZ/McqauwTq7Bg==
+=BHrV
+-----END PGP PUBLIC KEY BLOCK-----