Update Gemfile.lock

After the previous security update commit, as is usually the case, I got
an error when trying to run the site om my local machine.

Running

```
bundle clean --force
```
seems to have helped. I got that idea from
https://stackoverflow.com/a/50542424/126014, but as usual, when it comes
to Ruby and its ecosystem, I really have no idea what I'm doing.

Author: ploeh

Gemfile.lock

@@ -70,6 +70,7 @@ GEM
     tzinfo-data (1.2023.4)
       tzinfo (>= 1.0.0)
     unicode-display_width (2.5.0)
+    wdm (0.1.1)
     webrick (1.8.1)
 
 PLATFORMS
@@ -84,6 +85,7 @@ DEPENDENCIES
   jekyll-sitemap
   pygments.rb
   tzinfo-data
+  wdm (>= 0.1.0)
 
 BUNDLED WITH
    2.5.10