Bump actions/cache from 2.1.6 to 2.1.7

Bumps [actions/cache](https://github.com/actions/cache) from 2.1.6 to 2.1.7.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](https://github.com/actions/cache/compare/v2.1.6...v2.1.7)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

.github/workflows/maven.yml

@@ -32,7 +32,7 @@ jobs:
         
     steps:
     - uses: actions/checkout@v2.3.5
-    - uses: actions/cache@v2.1.6
+    - uses: actions/cache@v2.1.7
       with:
         path: ~/.m2/repository
         key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}

src/changes/changes.xml

@@ -54,6 +54,7 @@
       <action                 type="update" dev="ggregory" due-to="Dependabot">Bump maven-pmd-plugin from 3.14.0 to 3.15.0 #184.</action>
       <action                 type="update" dev="ggregory" due-to="Gary Gregory">Bump opencsv from 5.5.1 to 5.5.2 #182.</action>
       <action                 type="update" dev="ggregory" due-to="Dependabot">Bump spotbugs-maven-plugin from 4.3.0 to 4.4.2.2 #192.</action>
+      <action                 type="update" dev="kinow" due-to="Dependabot">Bump actions/cache from 2.1.6 to 2.1.7 #196.</action>
     </release>
     <release version="1.9.0" date="2021-07-24" description="Feature and bug fix release (Java 8)">
       <!-- FIX -->