Bump wala.version from 1.6.0 to 1.6.6

Bumps `wala.version` from 1.6.0 to 1.6.6.

Updates `com.ibm.wala:com.ibm.wala.util` from 1.6.0 to 1.6.6
- [Release notes](https://github.com/wala/WALA/releases)
- [Commits](wala/WALA@v1.6.0...v1.6.6)

Updates `com.ibm.wala:com.ibm.wala.shrike` from 1.6.0 to 1.6.6
- [Release notes](https://github.com/wala/WALA/releases)
- [Commits](wala/WALA@v1.6.0...v1.6.6)

Updates `com.ibm.wala:com.ibm.wala.core` from 1.6.0 to 1.6.6
- [Release notes](https://github.com/wala/WALA/releases)
- [Commits](wala/WALA@v1.6.0...v1.6.6)

Updates `com.ibm.wala:com.ibm.wala.cast` from 1.6.0 to 1.6.6
- [Release notes](https://github.com/wala/WALA/releases)
- [Commits](wala/WALA@v1.6.0...v1.6.6)

Updates `com.ibm.wala:com.ibm.wala.cast.java` from 1.6.0 to 1.6.6
- [Release notes](https://github.com/wala/WALA/releases)
- [Commits](wala/WALA@v1.6.0...v1.6.6)

---
updated-dependencies:
- dependency-name: com.ibm.wala:com.ibm.wala.util
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: com.ibm.wala:com.ibm.wala.shrike
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: com.ibm.wala:com.ibm.wala.core
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: com.ibm.wala:com.ibm.wala.cast
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: com.ibm.wala:com.ibm.wala.cast.java
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pom.xml

@@ -29,7 +29,7 @@
     <maven.compiler.version>3.13.0</maven.compiler.version>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <build-alias>b000</build-alias>
-    <wala.version>1.6.0</wala.version>
+    <wala.version>1.6.6</wala.version>
     <spotless.version>2.43.0</spotless.version>
     <maven.surefire.version>3.3.1</maven.surefire.version>
     <parallel>both</parallel>