Bump rack-session from 2.1.1 to 2.1.2

[dependabot]

Bumps rack-session from 2.1.1 to 2.1.2.

Changelog

Sourced from rack-session's changelog.

v2.1.2

• CVE-2026-39324 Don't fall back to unencrypted coder if encryptors are present.

Commits

• 504367b Bump patch version.
• f43638c Don't fall back to unencrypted coder if encryptors are present.
• dadcfe6 Bump actions/checkout from 4 to 5 (#54)
• 4eb9ea8 Add top level session spec to validate existing formats.
• 8f94577 Add rails to external tests.
• 38ea47d Allow the v2 encryptor to serialize messages with Marshal (#44)
• 43f2e3a Fix compatibility with older Rubies.
• 6a060b8 Support UTF-8 data when using the JSON serializer (#39)
• 8ce0146 Fix auth_tag retrieval on JRuby (#32)
• 7727185 Add AEAD encryption (#23)
• See full diff in compare view

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.02%. Comparing base (5f31e0f) to head (5438a0a).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2033      +/-   ##
==========================================
+ Coverage   95.96%   96.02%   +0.05%     
==========================================
  Files         158      158              
  Lines        7169     7169              
==========================================
+ Hits         6880     6884       +4     
+ Misses        289      285       -4     

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[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.