Update test certs (open-telemetry#29109)

**Description:** <Describe what has changed.>
<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
This re-enables the failing tests and updates the expired certificates.

New cert expiration dates:
```
$ openssl x509 -enddate -noout -in testdata/certs/cert.pem
notAfter=Mar 13 22:55:27 3023 GMT
$ openssl x509 -enddate -noout -in testdata/certs/ca.pem
notAfter=Mar 13 22:47:43 3023 GMT
```
**Link to tracking Issue:** <Issue number if applicable>
Fixes open-telemetry#29099

**Testing:** <Describe what testing was performed and which tests were
added.>
Tests are now passing.

**Documentation:** <Describe the documentation added.>

exporter/signalfxexporter/testdata/certs/ca.pem

@@ -1,19 +1,21 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----

exporter/signalfxexporter/testdata/certs/cert-key.pem

@@ -1,27 +1,28 @@
------BEGIN RSA PRIVATE KEY-----
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------END RSA PRIVATE KEY-----
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----

exporter/signalfxexporter/testdata/certs/cert.pem

@@ -1,20 +1,20 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----