v0.4.3: Maintenance release

Welcome to go-mail v0.4.3! This is mainly a maintenance release introducing some minor fixes and improvements. I want to go back to tighter release schedule, so the users that provided PRs don't have to wait too long for their PRs to make it into a release.

I want to thank @NorbertHauriel, @alfa-alex and @lipangeng for their contributions to this release!

What's Changed

• Add GetBoundary method and corresponding test by @wneessen in #253
• fix(typo): Error text in DialAndSendWithContext by @NorbertHauriel in #263
• Add 7bit support for EML parsing by @wneessen in #270
• Refactor: Handle missing Content-Type as plain text by @wneessen in #272
• Fix typo / inconsistency in Msg method by @alfa-alex in #278
• Support lowercase username and password challenge by @lipangeng in #282
• Fix linter errors by @wneessen in #283
• Fix CI/CD pipeline by @wneessen in #285

CI/CD maintenance changes

• Bump github/codeql-action from 3.25.10 to 3.25.11 by @dependabot in #252
• Bump sonarsource/sonarqube-scan-action from 2.2.0 to 2.3.0 by @dependabot in #254
• Bump fsfe/reuse-action from 3.0.0 to 4.0.0 by @dependabot in #255
• Bump actions/upload-artifact from 4.3.3 to 4.3.4 by @dependabot in #256
• Bump actions/setup-go from 5.0.1 to 5.0.2 by @dependabot in #257
• Bump github/codeql-action from 3.25.11 to 3.25.12 by @dependabot in #259
• Bump actions/dependency-review-action from 4.3.3 to 4.3.4 by @dependabot in #258
• Bump step-security/harden-runner from 2.8.1 to 2.9.0 by @dependabot in #260
• Bump github/codeql-action from 3.25.12 to 3.25.13 by @dependabot in #261
• Bump github/codeql-action from 3.25.13 to 3.25.14 by @dependabot in #264
• Bump ossf/scorecard-action from 2.3.3 to 2.4.0 by @dependabot in #266
• Bump github/codeql-action from 3.25.14 to 3.25.15 by @dependabot in #265
• Bump golangci/golangci-lint-action from 6.0.1 to 6.1.0 by @dependabot in #267
• Bump actions/upload-artifact from 4.3.4 to 4.3.5 by @dependabot in #273
• Bump step-security/harden-runner from 2.9.0 to 2.9.1 by @dependabot in #274
• Bump github/codeql-action from 3.25.15 to 3.26.0 by @dependabot in #275
• Bump actions/upload-artifact from 4.3.5 to 4.3.6 by @dependabot in #276
• Bump sonarsource/sonarqube-scan-action from 2.3.0 to 3.0.0 by @dependabot in #277
• Bump github/codeql-action from 3.26.0 to 3.26.1 by @dependabot in #280
• Bump github/codeql-action from 3.26.1 to 3.26.2 by @dependabot in #281

New Contributors

• @NorbertHauriel made their first contribution in #263
• @alfa-alex made their first contribution in #278
• @lipangeng made their first contribution in #282

Full Changelog: v0.4.2...v0.4.3