Bump backrefs from 7.0 to 8.0 in the production-dependencies group across 1 directory

[dependabot]

Bumps the production-dependencies group with 1 update in the / directory: backrefs.

Updates backrefs from 7.0 to 8.0

Release notes

Sourced from backrefs's releases.

8.0

• NEW: Backrefs will preemptively fail, raising a PatternError, if parsing and finding an unterminated character set ([]) or an unterminated subpattern (()). Both re and regex already do this (re just issues a warning on Python 3.10), but backrefs will now terminate parsing early instead of waiting for the underlying regular expression parsers to catch it after the fact. This will occur even on Python 3.10. If Python 3.10 behavior is required, please use Backrefs 7.0 until migration is possible.
• NEW: Backrefs will now raise a PatternError in bre if global flag syntax is not used at the start of the pattern. Python re already does this, except on Python 3.10 where a warning is raised. Backrefs will now do this in bre, even on Python 3.10, to prevent backtracking in Backrefs' parser when global flags are redefined. If the old behavior is required, please use 7.0 until migration is possible.
• NEW: Backrefs will now raise a PatternError in bregex if a global flag is not used at the start of the pattern. This does not affect inline flags that use the global syntax (e.g. (?i)) as regex allows this to be scoped to subpatterns ((...)) and affects the pattern after its insertion whether in a subpattern or outside a subpattern. While regex doesn't specifically restrict global flag insertion, only the last instance takes effect, Backrefs requires these global flags to be declared at the beginning of the pattern to prevent backtracking when parsing the pattern. If the old behavior is required, please use 7.0 until migration is possible.
• NEW: Various ValueError and SyntaxError that used to be raised by the bre or bregex parser are now raised as backrefs.util.PatternError.
• FIX: Fixes in bregex related to regex handling of inline flags using global syntax.

Commits

• dc978e3 Pattern parsing adjustment/fixes and normalize pattern exceptions (#202)
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