Fix GCC-14 [-Wincompatible-pointer-types] issues. (#546)

* Fix class assignment.

* One more fix.

* Bump bearssl version.

chronos.nimble

@@ -10,7 +10,7 @@ skipDirs      = @["tests"]
 requires "nim >= 1.6.16",
          "results",
          "stew",
-         "bearssl",
+         "bearssl >= 0.2.3",
          "httputils",
          "unittest2"
 

chronos/streams/tlsstream.nim

@@ -511,7 +511,8 @@ proc newTLSClientAsyncStream*(
   if TLSFlags.NoVerifyHost in flags:
     sslClientInitFull(res.ccontext, addr res.x509, nil, 0)
     x509NoanchorInit(res.xwc, addr res.x509.vtable)
-    sslEngineSetX509(res.ccontext.eng, addr res.xwc.vtable)
+    sslEngineSetX509(res.ccontext.eng,
+                     X509ClassPointerConst(addr res.xwc.vtable))
   else:
     when trustAnchors is TrustAnchorStore:
       res.trustAnchors = trustAnchors
@@ -611,7 +612,8 @@ proc newTLSServerAsyncStream*(rsource: AsyncStreamReader,
                        uint16(maxVersion))
 
   if not isNil(cache):
-    sslServerSetCache(res.scontext, addr cache.context.vtable)
+    sslServerSetCache(
+      res.scontext, SslSessionCacheClassPointerConst(addr cache.context.vtable))
 
   if TLSFlags.EnforceServerPref in flags:
     sslEngineAddFlags(res.scontext.eng, OPT_ENFORCE_SERVER_PREFERENCES)