Update github-linguist requirement to >= 5.1, < 6.1 (#43)

Updates the requirements on [github-linguist](https://github.com/github/linguist) to permit the latest version.
- [Release notes](https://github.com/github/linguist/releases)
- [Commits](github-linguist/linguist@v5.3.3...v6.0.1)

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

Gemfile.lock

@@ -4,7 +4,7 @@ PATH
     bringit (1.0.0)
       activesupport (>= 4.0)
       charlock_holmes (~> 0.7.3)
-      github-linguist (>= 5.1, < 5.4)
+      github-linguist (>= 5.1, < 6.1)
       rugged (~> 0.26.0)
 
 GEM
@@ -36,17 +36,17 @@ GEM
     debug_inspector (0.0.3)
     diff-lcs (1.3)
     docile (1.3.0)
-    escape_utils (1.1.1)
+    escape_utils (1.2.1)
     factory_bot (4.8.2)
       activesupport (>= 3.0.0)
     faker (1.8.7)
       i18n (>= 0.7)
     fuubar (2.3.1)
       rspec-core (~> 3.0)
       ruby-progressbar (~> 1.4)
-    github-linguist (5.3.3)
+    github-linguist (6.0.1)
       charlock_holmes (~> 0.7.5)
-      escape_utils (~> 1.1.0)
+      escape_utils (~> 1.2.0)
       mime-types (>= 1.19)
       rugged (>= 0.25.1)
     i18n (0.9.5)

bringit.gemspec

@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
   s.homepage    =
     'https://github.com/ontohub/bringit'
 
-  s.add_dependency('github-linguist', '>= 5.1', '< 5.4')
+  s.add_dependency('github-linguist', '>= 5.1', '< 6.1')
   s.add_dependency('activesupport', '>= 4.0')
   s.add_dependency('rugged', '~> 0.26.0')
   s.add_dependency('charlock_holmes', '~> 0.7.3')