chore(bindings): regenerate and bump protobuf-java to 4.34.2

origin/main's flake.lock update bumped the bundled protoc from 32.x
to libprotoc 34.1 via nixpkgs 26.05. The new gencode calls indexed
descriptor accessors (getMessageType(int), getEnumType(int),
getValue(int)) that were introduced in protobuf-java 4.33 and absent
from 4.32.1, and also pins validateProtobufGencodeVersion(4, 34, 1),
so the runtime in bindings/{java,kotlin}/pom.xml has to be at least
4.34.0. Bump to 4.34.2 (latest patch on the matching minor).

Author: jupblb

bindings/haskell/src/Proto/Scip.hs

@@ -45,9 +45,9 @@
       Protobuf 4 generated code calls validateProtobufGencodeVersion() at
       class load: the runtime version must be >= the gencode version within
       the same major version. Consumers who pull a newer protobuf-java
-      transitively are fine; consumers who downgrade to <4.32.1 will crash.
+      transitively are fine; consumers who downgrade to <4.34.2 will crash.
     -->
-    <protobuf.version>4.32.1</protobuf.version>
+    <protobuf.version>4.34.2</protobuf.version>
     <project.build.outputTimestamp>${git.commit.time}</project.build.outputTimestamp>
   </properties>