Bump dev.cel:cel from 0.11.1 to 0.12.0 (#425)

Bumps [dev.cel:cel](https://github.com/google/cel-java) from 0.11.1 to
0.12.0.
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gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 [versions]
 assertj = "3.27.7"
 buf = "1.66.0"
-cel = "0.11.1"
+cel = "0.12.0"
 error-prone = "2.48.0"
 junit = "5.14.3"
 maven-publish = "0.36.0"