chore(deps): bump pypdfium2 from 4.30.0 to 5.6.0

[dependabot]

Bumps pypdfium2 from 4.30.0 to 5.6.0.

Release notes

Sourced from pypdfium2's releases.

5.6.0

Changes (Release 5.6.0)

Summary (pypdfium2)

• In our cibuildwheel workflow, all targets now exercise pypdfium2's test suite. This is implemented as a custom post-cibuildwheel step, using Debian 13 or Alpine 3 containers, respectively. Note, there are known test failures on s390x and musllinux_armv7l (but we still provide builds). In particular, on s390x, opening password-protected PDFs is broken. s390x is "use at own risk"; there is absolutely no warranty.
• Other workflow and cibuildwheel config improvements.

Commits between 5.5.0 and 5.6.0 (latest commit first):

• ec956bb [autorelease main] update 5.6.0
• d9ce037 fix typo
• 4545595 Update changelog
• a1ec5b0 build(deps): bump actions/attest-build-provenance from 3 to 4
• 3e46f46 build(deps): bump actions/download-artifact from 7 to 8
• 49fcb7f build(deps): bump actions/upload-artifact from 6 to 7
• b82a5ee Simplify previous commit
• d1924b9 cibw: q&d: suppress known test suite failures
• eb9ed99 Add post-cibuildwheel testing (#404)
• 16bc5c4 Amend "cibw workflows: drop emulated property"
• 248d2a4 sbuild_one_native: merge install steps
• 477825b cibw: try enable pypdfium2's test suite on musl
• 3f5071e cibw: merge linux_s390x into linux_clangcross
• fc8e50b cibw workflows: drop emulated property
• 64d72f6 cibw: try to reuse build params
• 9c6e0fc pyproject.toml: all targets now use vendored libraries
• da7a887 build_native --clang-as-gcc: drop one more symlink
• baabc1e build_native --clang-as-gcc: take toolprefix into account
• e49e534 build_native: --clang-as-gcc: remove unused tools, add task

Commits between 7690 and 7713 (latest commit first):

• fcfdf1c3e Polish CPDF_FontSubsetter and its embedder tests
• eeb8a196d Rename CPDF_Font's GetCharWidthF() to GetCharWidth()
• ede18738c Subset the /W array during font subsetting
• 311845fbb Move and update CreateWidthsArray()
• 546af275b Subset /ToUnicode streams during font subsetting
• e56a50934 Move and update LoadUnicode()
• c3c6a7474 Add text extraction tests for font subsetting
• 054cb1f79 Modernize CFGAS_FontDescriptor::Rank comparisons.

... (truncated)

Commits

• ec956bb [autorelease main] update 5.6.0
• d9ce037 fix typo
• 4545595 Update changelog
• a1ec5b0 build(deps): bump actions/attest-build-provenance from 3 to 4
• 3e46f46 build(deps): bump actions/download-artifact from 7 to 8
• 49fcb7f build(deps): bump actions/upload-artifact from 6 to 7
• b82a5ee Simplify previous commit
• d1924b9 cibw: q&d: suppress known test suite failures
• eb9ed99 Add post-cibuildwheel testing (#404)
• 16bc5c4 Amend "cibw workflows: drop emulated property"
• Additional commits viewable in compare view

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[dependabot]

Superseded by #53.