Update gittools/actions action to v0.13.6

Author: renovate[bot]

.github/workflows/build.yml

@@ -9,10 +9,10 @@ jobs:
       - uses: actions/checkout@v2
         with:
           fetch-depth: 0
-      - uses: gittools/actions/gitversion/setup@v0.10.2
+      - uses: gittools/actions/gitversion/setup@v0.13.6
         with:
           versionSpec: '5.12.x'
-      - uses: gittools/actions/gitversion/execute@v0.10.2
+      - uses: gittools/actions/gitversion/execute@v0.13.6
         id: gitversion
       - name: Set version (release)
         if: github.ref_type == 'tag'