support solc v0.8.34 (#482)

As a drive-by fix, the get-llvm action now ignores LLVM releases marked
as pre-release.

---------

Signed-off-by: xermicus <bigcyrill@hotmail.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

js/emscripten/package.json

@@ -2,7 +2,7 @@
   "name": "revive",
   "private": true,
   "dependencies": {
-    "solc": ">=0.8.0 <=0.8.33"
+    "solc": ">=0.8.0 <=0.8.34"
   },
   "scripts": {
     "example:web": "http-server ./examples/web/",