chore: Ignore docs directory for dependabot

[hughhhh]

SUMMARY

Ignore all request to update dependencies for the docs repo. Piggy backing #12291, and reading the GH doc this seems promising

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #17451 (d72fb2f) into master (1e2c834) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #17451   +/-   ##
=======================================
  Coverage   76.95%   76.95%           
=======================================
  Files        1042     1042           
  Lines       56287    56287           
  Branches     7796     7796           
=======================================
+ Hits        43316    43318    +2     
+ Misses      12713    12711    -2     
  Partials      258      258           

Flag	Coverage Δ
hive	81.53% <ø> (ø)
javascript	71.05% <ø> (ø)
mysql	81.95% <ø> (ø)
postgres	81.96% <ø> (ø)
presto	81.83% <ø> (+<0.01%)	⬆️
python	82.46% <ø> (+<0.01%)	⬆️
sqlite	81.64% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superset/db_engine_specs/presto.py	90.37% <0.00%> (+0.41%)	⬆️

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