initialise default TLS crypto provider with aws_lc_rs manually

we use ring for hashing state and ruma, and reqwest/rustls defaults
to aws_lc_rs, so we have to manually pick which one. there doesn't
seem to be a way to just use one for some reason, so lets just use
the new aws_lc_rs.

Signed-off-by: strawberry <strawberry@puppygock.gay>

src/core/Cargo.toml

@@ -82,6 +82,7 @@ regex.workspace = true
 reqwest.workspace = true
 ring.workspace = true
 ruma.workspace = true
+rustls.workspace = true
 sanitize-filename.workspace = true
 serde_json.workspace = true
 serde_regex.workspace = true