DEV: Drop leading zeros from version number (#37010)

We originally intended to format our new calendar-based version numbers
with leading zeros in the 'minor' (/month) segment. However, leading
zeros are actually invalid semver, and these version numbers will fail
to parse in some version-number libraries (e.g. npm's `semver` lib).

This commit switches the currently-in-development version from `2026.01`
to `2026.1`. No released versions are affected, because they were `.11`
and `.12`.

lib/tasks/release.rake

@@ -225,11 +225,11 @@ namespace :release do
       if Gem::Version.new(target_version_number) <= Gem::Version.new(current_version)
         puts "Target version #{current_version} is already >= #{target_version_number}. Incrementing instead."
         major, minor, patch_and_pre = current_version.split(".")
-        minor = (minor.to_i + 1).to_s.rjust(2, "0")
+        minor = (minor.to_i + 1).to_s
 
         if minor.to_i > 12 && Time.now.month == 12
           major = (major.to_i + 1).to_s
-          minor = "01"
+          minor = "1"
         end
 
         target_version_number = "#{major}.#{minor}.#{patch_and_pre}"

lib/version.rb

@@ -7,7 +7,7 @@ module Discourse
   unless defined?(::Discourse::VERSION)
     module VERSION #:nodoc:
       # Use the `version_bump:*` rake tasks to update this value
-      STRING = "2026.01.0-latest"
+      STRING = "2026.1.0-latest"
 
       PARTS = STRING.split(".")
       private_constant :PARTS

spec/tasks/release_spec.rb

@@ -258,7 +258,7 @@ RSpec.describe "tasks/version_bump" do
         run "git", "reset", "--hard"
         run "git", "checkout", "version-bump/main"
         version_rb_content = File.read("lib/version.rb")
-        expect(version_rb_content).to include('STRING = "2026.01.0-latest"')
+        expect(version_rb_content).to include('STRING = "2026.1.0-latest"')
       end
     end