Updates demo certs used in integ tests (opensearch-project#1115)

Signed-off-by: Darshit Chanpura <[email protected]>

alerting/src/test/resources/sample.pem

@@ -1,28 +1,25 @@
 -----BEGIN CERTIFICATE-----
-MIIEyTCCA7GgAwIBAgIGAWLrc1O2MA0GCSqGSIb3DQEBCwUAMIGPMRMwEQYKCZIm
-iZPyLGQBGRYDY29tMRcwFQYKCZImiZPyLGQBGRYHZXhhbXBsZTEZMBcGA1UECgwQ
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-MDM0MzQ3WhcNMjgwNDE5MDM0MzQ3WjBeMRIwEAYKCZImiZPyLGQBGRYCZGUxDTAL
-BgNVBAcMBHRlc3QxDTALBgNVBAoMBG5vZGUxDTALBgNVBAsMBG5vZGUxGzAZBgNV
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-eIZNf55PNPtGzOrvvONiui48vBKH1LsCAwEAAaOCAVkwggFVMIG8BgNVHSMEgbQw
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-hvcNAQELBQADggEBAIOKuyXsFfGv1hI/Lkpd/73QNqjqJdxQclX57GOMWNbOM5H0
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-e/9kkAtQRgpTb3skYdIOOUOV0WGQ60kJlFhAzIs=
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+BEAwPogFKgMEBQWCEm5vZGUtMC5leGFtcGxlLmNvbYIJbG9jYWxob3N0hxAAAAAA
+AAAAAAAAAAAAAAABhwR/AAABMAsGA1UdDwQEAwIF4DAdBgNVHSUEFjAUBggrBgEF
+BQcDAQYIKwYBBQUHAwIwDAYDVR0TAQH/BAIwADAdBgNVHQ4EFgQU0/qDQaY10jIo
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+zYkEOUF8Y25J6WeY88Yfnc0iigI+Pnz5NK8R9GL7TYo=
 -----END CERTIFICATE-----