Allow rails 7 gems in gemspec

[jrafanie]

Allow rails 7 gems in gemspec

Note, I dropped ruby 2.5/rails 5.2 from the matrix since they are far EOL.

[agrare]

@jrafanie can you add rails 7.0 to the test matrix?

[jrafanie]

Sure, I'll manually push to this one. There's a handful of lib gems like this.

[miq-bot]

Checked commits jrafanie/inventory_refresh@adef7e8~...be68fe7 with ruby 2.7.8, rubocop 1.56.3, haml-lint 0.51.0, and yamllint
2 files checked, 0 offenses detected
Everything looks fine. ⭐

[jrafanie]

@jrafanie can you add rails 7.0 to the test matrix?

hey, that was easy... I had to drop 2.5/5.2 and add ruby 3.1 which required me to safe_load aliases: true in two places. Since we're supporting old rubies here, I kept it with safe_load since safe_load_file was only added fairly recently and I don't know if it always supported passing aliases: true. I went with the ugly but more portable method.

[agrare]

Released v2.1.0 with this change