MINOR: Bump org.apache.calcite.avatica:avatica from 1.25.0 to 1.26.0

Bumps [org.apache.calcite.avatica:avatica](https://github.com/apache/calcite-avatica) from 1.25.0 to 1.26.0.
- [Commits](apache/calcite-avatica@rel/avatica-1.25.0...rel/avatica-1.26.0)

---
updated-dependencies:
- dependency-name: org.apache.calcite.avatica:avatica
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

flight/flight-sql-jdbc-core/pom.xml

@@ -115,7 +115,7 @@ under the License.
     <dependency>
       <groupId>org.apache.calcite.avatica</groupId>
       <artifactId>avatica</artifactId>
-      <version>1.25.0</version>
+      <version>1.26.0</version>
     </dependency>
 
     <dependency>