fix: add new SSL certificate

[vmx]

When running the tests I got errors like this:

Error: error:140AB18E:SSL routines:SSL_CTX_use_certificate:ca md too weak

In order to fix this I created a new certificate. I thought 100 years of
validity might be enough. The command to create it was (based on
https://letsencrypt.org/docs/certificates-for-localhost/):

openssl req -x509 -out cert.pem -keyout privkey.pem \
  -newkey rsa:2048 -nodes -sha256 \
  -subj '/CN=localhost' -extensions EXT -config <( \
   printf "[dn]\nCN=localhost\n[req]\ndistinguished_name = dn\n[EXT]\nsubjectAltName=DNS:localhost\nkeyUsage=digitalSignature\nextendedKeyUsage=serverAuth") \
  -days 36524

To verify, run from within js-ipfs:

npx mocha test/core/interface.spec.js --grep 'should add from a HTTPS URL'