Update aruco.bib with core ArUco and AprilTag references

[Shashikumar-ezhilarasu]

Description

This PR updates the aruco.bib file located at modules/aruco/doc/aruco.bib to include essential references for ArUco and AprilTag fiducial markers.

Changes included:

• Added foundational ArUco marker papers (Garrido-Jurado et al., 2014)
• Added AprilTag papers (Olson 2011, Wang 2016, Mueller 2017)
• Added ARTag and ARToolKit references
• Included key algorithms such as RANSAC, EPnP, and camera calibration papers used in fiducial detection
• Removed duplicate or irrelevant entries for conciseness

Motivation:
The previous .bib file lacked several key references, which are important for developers, students, and researchers using the ArUco module. This update ensures proper citation and improves documentation completeness.

Impact:

• Documentation update only (.bib)
• No code or functionality changes

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Pull Request Readiness Checklist

• I agree to contribute to the project under Apache 2 License
• To the best of my knowledge, the proposed patch is not based on code under GPL or another license that is incompatible with OpenCV
• The PR is proposed to the proper branch (master or 4.x depending on repo guidelines)
• There is a reference to the original work and related research:
  • Original aruco.bib lacked key ArUco/AprilTag references
  • References added based on papers:
    • Garrido-Jurado et al., 2014 (ArUco)
    • Olson, 2011 (AprilTag)
    • Wang & Olson, 2016 (AprilTag 2)
    • Mueller et al., 2017 (AprilTag 3)
    • Others: Fiala 2005, Kato & Billinghurst 1999, Fischler & Bolles 1981, Bradski 2000
• Accuracy test, performance test, and test data are not applicable, as this is purely a documentation update
• The feature is well documented, and sample code can still be built without any issues

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Note for Maintainers

This is a purely documentation PR, intended to improve scholarly references in the aruco module. No functional changes have been made.
Thank you !!