Bump fog-core from 2.5.0 to 2.6.0

Bumps [fog-core](https://github.com/fog/fog-core) from 2.5.0 to 2.6.0.
- [Changelog](https://github.com/fog/fog-core/blob/master/changelog.md)
- [Commits](fog/fog-core@v2.5.0...v2.6.0)

---
updated-dependencies:
- dependency-name: fog-core
  dependency-type: indirect
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -67,7 +67,7 @@ GEM
     ethon (0.16.0)
       ffi (>= 1.15.0)
     eventmachine (1.2.7)
-    excon (0.112.0)
+    excon (1.0.0)
     execjs (2.9.1)
     fast_blank (1.0.1)
     fastimage (2.3.1)
@@ -83,9 +83,9 @@ GEM
       fog-core (~> 2.1)
       fog-json (~> 1.1)
       fog-xml (~> 0.1)
-    fog-core (2.5.0)
+    fog-core (2.6.0)
       builder
-      excon (~> 0.71)
+      excon (~> 1.0)
       formatador (>= 0.2, < 2.0)
       mime-types
     fog-json (1.2.0)