Update keyfiles

This commit replaces the previous keyfiles with those generated by the commands added in the previous commit.
diff --git a/tests/data_files/keyfile_4096 b/tests/data_files/keyfile_4096
index 4999077..d9d3cf4 100644
--- a/tests/data_files/keyfile_4096
+++ b/tests/data_files/keyfile_4096
@@ -1,51 +1,51 @@
 -----BEGIN RSA PRIVATE KEY-----
-MIIJKgIBAAKCAgEAkfkL9r8wEbm5rrsc9TwDi0lUaf6MPgYt+31JveSBl3EAX2HB
-DlQLXSYHtFpj1p8Qi6peXf4U20+o6+MefB35J9eN75cpl4F0UY1zoXT3juF3T4f7
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 -----END RSA PRIVATE KEY-----