Updates demo certs used in integ tests (#1291) (#1296) (#1298)

Signed-off-by: Darshit Chanpura <[email protected]>
(cherry picked from commit 285f7fe)

Co-authored-by: Darshit Chanpura <[email protected]>
(cherry picked from commit 99679bc)

Co-authored-by: opensearch-trigger-bot[bot] <98922864+opensearch-trigger-bot[bot]@users.noreply.github.com>

plugin/src/test/resources/security/sample.pem

@@ -1,28 +1,25 @@
 -----BEGIN CERTIFICATE-----
-MIIEyTCCA7GgAwIBAgIGAWLrc1O2MA0GCSqGSIb3DQEBCwUAMIGPMRMwEQYKCZIm
-iZPyLGQBGRYDY29tMRcwFQYKCZImiZPyLGQBGRYHZXhhbXBsZTEZMBcGA1UECgwQ
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-AwQFBYISbm9kZS0wLmV4YW1wbGUuY29tgglsb2NhbGhvc3SHBH8AAAEwDQYJKoZI
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-e/9kkAtQRgpTb3skYdIOOUOV0WGQ60kJlFhAzIs=
------END CERTIFICATE-----
+MIIEPDCCAySgAwIBAgIUZjrlDPP8azRDPZchA/XEsx0X2iIwDQYJKoZIhvcNAQEL
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+AAAAAAAAAAAAAAABhwR/AAABMAsGA1UdDwQEAwIF4DAdBgNVHSUEFjAUBggrBgEF
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+-----END CERTIFICATE-----