Bump dagger-compiler from 2.39.1 to 2.40 in /Plan (#2140)

Bumps [dagger-compiler](https://github.com/google/dagger) from 2.39.1 to 2.40.
- [Release notes](https://github.com/google/dagger/releases)
- [Changelog](https://github.com/google/dagger/blob/master/CHANGELOG.md)
- [Commits](https://github.com/google/dagger/compare/dagger-2.39.1...dagger-2.40)

---
updated-dependencies:
- dependency-name: com.google.dagger:dagger-compiler
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Plan/build.gradle

@@ -63,7 +63,7 @@ subprojects {
 
     ext {
         daggerVersion = "2.39.1"
-        daggerCompilerVersion = "2.39.1"
+        daggerCompilerVersion = "2.40"
 
         palVersion = "5.0.0"