svn.einsteintoolkit.org uses old SSL library

Currently svn.einsteintoolkit.org uses an old SSL library that does not support the newer TLS versions that newer OpenSSL libraries require.

Eg:

rhaas@fdea4908:~$ svn checkout 'https://svn.einsteintoolkit.org/pyGWAnalysis/trunk'
svn: E170013: Unable to connect to a repository at URL 'https://svn.einsteintoolkit.org/pyGWAnalysis/trunk'
svn: E120171: Error running context: An error occurred during SSL communication

and more details via the curl

curl -v https://svn.einsteintoolkit.org

*   Trying 130.39.21.25...
* TCP_NODELAY set
* Expire in 200 ms for 4 (transfer 0x55b80d165dd0)
* Connected to svn.einsteintoolkit.org (130.39.21.25) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: none
  CApath: /etc/ssl/certs
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (OUT), TLS alert, protocol version (582):
* error:1425F102:SSL routines:ssl_choose_client_version:unsupported protocol
* Closing connection 0

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