build(deps): bump rack from 3.1.18 to 3.1.20 in /spec/rails7_stub

Bumps [rack](https://github.com/rack/rack) from 3.1.18 to 3.1.20.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v3.1.18...v3.1.20)

---
updated-dependencies:
- dependency-name: rack
  dependency-version: 3.1.20
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

spec/rails7_stub/Gemfile.lock

@@ -79,21 +79,27 @@ GEM
       tzinfo (~> 2.0, >= 2.0.5)
     base64 (0.3.0)
     benchmark (0.4.1)
+    bigdecimal (3.3.1)
     bigdecimal (3.3.1-java)
     builder (3.3.0)
+    cgi (0.5.0)
     cgi (0.5.0-java)
     concurrent-ruby (1.3.5)
     connection_pool (2.5.4)
     crass (1.0.6)
+    date (3.4.1)
     date (3.4.1-java)
     drb (2.2.3)
+    erb (4.0.4)
+      cgi (>= 0.3.3)
     erb (4.0.4-java)
       cgi (>= 0.3.3)
     erubi (1.13.1)
     globalid (1.3.0)
       activesupport (>= 6.1)
     i18n (1.14.7)
       concurrent-ruby (~> 1.0)
+    io-console (0.8.1)
     io-console (0.8.1-java)
     irb (1.15.2)
       pp (>= 0.6.0)
@@ -122,17 +128,24 @@ GEM
       timeout
     net-smtp (0.5.1)
       net-protocol
+    nio4r (2.7.4)
     nio4r (2.7.4-java)
     nokogiri (1.18.10-java)
       racc (~> 1.4)
+    nokogiri (1.18.10-x86_64-linux-gnu)
+      racc (~> 1.4)
     pp (0.6.3)
       prettyprint
     prettyprint (0.2.0)
+    psych (5.2.6)
+      date
+      stringio
     psych (5.2.6-java)
       date
       jar-dependencies (>= 0.1.7)
+    racc (1.8.1)
     racc (1.8.1-java)
-    rack (3.1.18)
+    rack (3.1.20)
     rack-session (2.1.1)
       base64 (>= 0.1.0)
       rack (>= 3.0.0)
@@ -177,12 +190,16 @@ GEM
     reline (0.6.2)
       io-console (~> 0.5)
     securerandom (0.4.1)
+    stringio (3.2.0)
     thor (1.4.0)
     timeout (0.4.3)
     tsort (0.2.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
     useragent (0.16.11)
+    websocket-driver (0.8.0)
+      base64
+      websocket-extensions (>= 0.1.0)
     websocket-driver (0.8.0-java)
       base64
       websocket-extensions (>= 0.1.0)
@@ -196,6 +213,7 @@ PLATFORMS
   universal-java-21
   universal-java-25
   universal-java-8
+  x86_64-linux
 
 DEPENDENCIES
   activerecord-jdbcpostgresql-adapter (~> 72.1)