Updates demo certs used in rest tests (#518) (#521)

(cherry picked from commit d797db5)

Signed-off-by: Darshit Chanpura <[email protected]>
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

src/test/resources/sample.pem

@@ -1,28 +1,25 @@
 -----BEGIN CERTIFICATE-----
-MIIEyTCCA7GgAwIBAgIGAWLrc1O2MA0GCSqGSIb3DQEBCwUAMIGPMRMwEQYKCZIm
-iZPyLGQBGRYDY29tMRcwFQYKCZImiZPyLGQBGRYHZXhhbXBsZTEZMBcGA1UECgwQ
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-BgNVBAcMBHRlc3QxDTALBgNVBAoMBG5vZGUxDTALBgNVBAsMBG5vZGUxGzAZBgNV
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-e/9kkAtQRgpTb3skYdIOOUOV0WGQ60kJlFhAzIs=
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+AAAAAAAAAAAAAAABhwR/AAABMAsGA1UdDwQEAwIF4DAdBgNVHSUEFjAUBggrBgEF
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+zYkEOUF8Y25J6WeY88Yfnc0iigI+Pnz5NK8R9GL7TYo=
 -----END CERTIFICATE-----