Update dotenv requirement from ~> 2.8.0 to >= 2.8, < 3.2

Updates the requirements on [dotenv](https://github.com/bkeepers/dotenv) to permit the latest version.
- [Release notes](https://github.com/bkeepers/dotenv/releases)
- [Changelog](https://github.com/bkeepers/dotenv/blob/main/Changelog.md)
- [Commits](bkeepers/dotenv@v2.8.1...v3.1.7)

---
updated-dependencies:
- dependency-name: dotenv
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -3,7 +3,7 @@ PATH
   specs:
     gold_miner (0.1.0)
       async (~> 2.6)
-      dotenv (~> 2.8.0)
+      dotenv (>= 2.8, < 3.2)
       dry-monads (~> 1.6)
       ruby-openai (~> 7.0)
       slack-ruby-client (~> 2.x)
@@ -32,7 +32,7 @@ GEM
       rexml
     diff-lcs (1.5.1)
     docile (1.4.0)
-    dotenv (2.8.1)
+    dotenv (3.1.7)
     dry-core (1.1.0)
       concurrent-ruby (~> 1.0)
       logger

gold_miner.gemspec

@@ -32,7 +32,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_dependency "async", "~> 2.6"
-  spec.add_dependency "dotenv", "~> 2.8.0"
+  spec.add_dependency "dotenv", ">= 2.8", "< 3.2"
   spec.add_dependency "dry-monads", "~> 1.6"
   spec.add_dependency "ruby-openai", "~> 7.0"
   spec.add_dependency "slack-ruby-client", "~> 2.x"