Fatal error while scanning apple/swift repo

New Issue Checklist

• Updated SwiftLint to the latest version
• I searched for existing GitHub issues

Describe the bug

SwiftLint docker crashes when I scan https://github.com/apple/swift:

• git clone https://github.com/apple/swift
• cd swift
• docker run -it -v `pwd`:`pwd` -w `pwd` ghcr.io/realm/swiftlint:0.50.3

Output (only stack trace, full output is huge)

SourceKittenFramework/File.swift:20: Fatal error: 'try!' expression unexpectedly raised an error: Error Domain=NSCocoaErrorDomain Code=261 "The specified text encoding isn’t applicable."
Current stack trace:
0                                       0x0000559b02f09170 <unavailable> + 30679408
1                                       0x0000559b02bdfa9c <unavailable> + 27363996
2                                       0x0000559b02bdf8b8 <unavailable> + 27363512
3                                       0x0000559b02bde543 <unavailable> + 27358531
4                                       0x0000559b02c3362c <unavailable> + 27706924
5                                       0x0000559b01d4cb03 <unavailable> + 12081923
6                                       0x0000559b02af654c <unavailable> + 26408268
7                                       0x0000559b02aec4c9 <unavailable> + 26367177
8                                       0x0000559b02b0a0fa <unavailable> + 26489082
9                                       0x0000559b02af64c2 <unavailable> + 26408130
10                                      0x0000559b01d4ca00 File.contents.getter + 35
11                                      0x0000559b01df9ba4 <unavailable> + 12790692
12                                      0x0000559b01dfaa6d <unavailable> + 12794477
13                                      0x0000559b01dfaa20 CollectedLinter.styleViolations(using:) + 8
14                                      0x0000559b0257a3fd <unavailable> + 20657149
15                                      0x0000559b02bbc67e <unavailable> + 27219582
16                                      0x0000559b02bbcd6c <unavailable> + 27221356
17                                      0x0000559b02b00845 <unavailable> + 26449989
18                                      0x0000559b02b005f3 <unavailable> + 26449395
19                                      0x0000559b02b0bee2 <unavailable> + 26496738
20   libc.so.6                          0x00007f436e330b43 <unavailable> + 609091
21   libc.so.6                          0x00007f436e3c1b70 clone + 68

Environment

• Ubuntu 22.04 (fully updated)
• Docker version 23.0.1, build a5ee5b1

Reproduce the reported Docker scan against apple/swift, then inspect SourceKittenFramework/File.swift around line 20, identified by the stack trace. Determine which input triggers NSCocoaErrorDomain 261, and verify that scanning the repository completes without the fatal error.