chore(deps): bump testbench.version from 9.1.0.rc1 to 9.1.0 (#17825)

Bumps `testbench.version` from 9.1.0.rc1 to 9.1.0.

Updates `com.vaadin:vaadin-testbench-core` from 9.1.0.rc1 to 9.1.0

Updates `com.vaadin:vaadin-testbench-shared` from 9.1.0.rc1 to 9.1.0

Updates `com.vaadin:vaadin-testbench-bom` from 9.1.0.rc1 to 9.1.0

---
updated-dependencies:
- dependency-name: com.vaadin:vaadin-testbench-core
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: com.vaadin:vaadin-testbench-shared
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: com.vaadin:vaadin-testbench-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

pom.xml

@@ -105,7 +105,7 @@
         <maven.resources.plugin.version>3.0.2</maven.resources.plugin.version>
         <maven.clean.plugin.version>3.3.1</maven.clean.plugin.version>
         <maven.exec.plugin.version>1.6.0</maven.exec.plugin.version>
-        <testbench.version>9.1.0.rc1</testbench.version>
+        <testbench.version>9.1.0</testbench.version>
         <jetty.version>11.0.15</jetty.version>
         <properties-maven-plugin.version>1.2.0</properties-maven-plugin.version>
         <build-helper-maven-plugin.version>3.4.0</build-helper-maven-plugin.version>