bpo-34542: Update test certs and keys (GH-8997) (GH-9007)

Update all test certs and keys to use future proof crypto settings:

* 3072 bit RSA keys
* SHA-256 signature

Signed-off-by: Christian Heimes <christian@python.org>
(cherry picked from commit e6dac0077996b1e1f886f036d6f2606237fa4c85)
diff --git a/Lib/test/revocation.crl b/Lib/test/revocation.crl
index 53cb4b3..c05461c 100644
--- a/Lib/test/revocation.crl
+++ b/Lib/test/revocation.crl
@@ -1,11 +1,14 @@
 -----BEGIN X509 CRL-----
-MIIBpjCBjwIBATANBgkqhkiG9w0BAQUFADBNMQswCQYDVQQGEwJYWTEmMCQGA1UE
+MIICJjCBjwIBATANBgkqhkiG9w0BAQsFADBNMQswCQYDVQQGEwJYWTEmMCQGA1UE
 CgwdUHl0aG9uIFNvZnR3YXJlIEZvdW5kYXRpb24gQ0ExFjAUBgNVBAMMDW91ci1j
-YS1zZXJ2ZXIXDTE4MDExOTE5MDkwNloXDTI3MTEyODE5MDkwNlqgDjAMMAoGA1Ud
-FAQDAgEAMA0GCSqGSIb3DQEBBQUAA4IBAQBYVzH8n2LdyJJ/t8CpWjz652hZJ0sY
-DeNYcwuTPzR9CbSwEwNbf0kY9bgWXGfoRD2SnnCnuNNJXO2MuXtxf6qYx2ZjhJm8
-qgxXs0Bz4agRswNMbumjHCmqIv1t88vbrO0+ItEZDK7RJVIMBtVJ0XYOHvD/IG/i
-zqa1Fl3uCTvQbTJ2TrqzJeP/Vl40hOD+VdBBZK3j0r4AkCKU3tAiHYTGmHKhPxy1
-f8Yet+4SRMGp1BdDezTI1bICpSZhRJ4geW0UzuCZnXPW8IZzioUmdUBAmAMHPWFr
-B0sTTc/ntD4jHG1/T5b0oiDMbXIbh5Iz9iQNcY0IbotkCw39h+K90wY6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 -----END X509 CRL-----