Fix ambiguity in get_index (for tests)

[tanderson92]

This fixes the following error:

RecurrenceMatrix: Error During Test at /home/thomas/Sync/OrthoPolySing/SingularIntegrals.jl/test/test_recurrence.jl:34
  Test threw exception
  Expression: r[100, :] ≈ r[100, 1:3]
  MethodError: getindex(::RecurrenceArray{Float64, 2, Vector{Float64}, Fill{Int64, 1, Tuple{InfiniteArrays.OneToInf{Int64}}}, Zeros{Int64, 1, Tuple{InfiniteArrays.OneToInf{Int64}}},

  Candidates:
    getindex(A::LazyArrays.AbstractCachedArray{T, 2} where T, k::Integer, jr::AbstractUnitRange)
      @ LazyArrays ~/.julia/packages/LazyArrays/oNvoa/src/cache.jl:104
    getindex(A::RecurrenceArray{T, 2, Z} where {T, Z<:(AbstractVector)}, k::Integer, jr::AbstractVector)
      @ SingularIntegrals ~/.julia/packages/SingularIntegrals/9azQG/src/recurrence.jl:159

  Possible fix, define
    getindex(::RecurrenceArray{T, 2, Z} where {T, Z<:(AbstractVector)}, ::Integer, ::AbstractUnitRange)

  Stacktrace:
   [1] macro expansion
     @ ~/Software/julia-1.9.0/share/julia/stdlib/v1.9/Test/src/Test.jl:478 [inlined]
   [2] macro expansion
     @ ~/Sync/OrthoPolySing/SingularIntegrals.jl/test/test_recurrence.jl:34 [inlined]
   [3] macro expansion
     @ ~/Software/julia-1.9.0/share/julia/stdlib/v1.9/Test/src/Test.jl:1498 [inlined]
   [4] macro expansion
     @ ~/Sync/OrthoPolySing/SingularIntegrals.jl/test/test_recurrence.jl:28 [inlined]
   [5] macro expansion
     @ ~/Software/julia-1.9.0/share/julia/stdlib/v1.9/Test/src/Test.jl:1498 [inlined]
   [6] top-level scope
     @ ~/Sync/OrthoPolySing/SingularIntegrals.jl/test/test_recurrence.jl:7
Test Summary:      | Pass  Error  Total  Time
RecurrenceArray    |   20      1     21  5.4s
  RecurrenceVector |   18            18  1.7s
  RecurrenceMatrix |    2      1      3  3.7s

[tanderson92]

Status `~/.julia/environments/OrthoPolySing/Project.toml`
  [28f2ccd6] ApproxFun v0.13.20
  [aae01518] BandedMatrices v0.17.23
  [b30e2e7b] ClassicalOrthogonalPolynomials v0.8.1
  [7ae1f121] ContinuumArrays v0.12.6
  [5078a376] LazyArrays v1.1.1
  [d7e5e226] LazyBandedMatrices v0.8.9
  [c4ea9172] QuasiArrays v0.9.8
  [d7440221] SingularIntegrals v0.0.1 `~/Sync/OrthoPolySing/SingularIntegrals.jl`

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.25 ⚠️

Comparison is base (96fd60e) 89.75% compared to head (e1091e9) 89.50%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
- Coverage   89.75%   89.50%   -0.25%     
==========================================
  Files           5        5              
  Lines         322      324       +2     
==========================================
+ Hits          289      290       +1     
- Misses         33       34       +1     

Impacted Files	Coverage Δ
src/recurrence.jl	96.73% <100.00%> (-1.07%)	⬇️

... and 1 file with indirect coverage changes

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