CompatHelper: bump compat for Zygote in [weakdeps] to 0.7, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the Zygote package from 0.6 to 0.6, 0.7.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[github-actions]

Benchmark Results

	master	a67873e...	master / a67873e...
eval/ComplexF32/evaluation	7.42 ± 0.59 ms	7.3 ± 0.57 ms	1.02
eval/ComplexF64/evaluation	10.9 ± 1.6 ms	10.9 ± 1.1 ms	1.01
eval/Float32/derivative	13.9 ± 2.5 ms	13.2 ± 1.9 ms	1.05
eval/Float32/derivative_turbo	13.9 ± 2.6 ms	13.2 ± 1.9 ms	1.06
eval/Float32/evaluation	2.83 ± 0.28 ms	2.78 ± 0.26 ms	1.02
eval/Float32/evaluation_bumper	0.627 ± 0.016 ms	0.629 ± 0.016 ms	0.996
eval/Float32/evaluation_turbo	0.607 ± 0.032 ms	0.597 ± 0.032 ms	1.02
eval/Float32/evaluation_turbo_bumper	0.63 ± 0.016 ms	0.632 ± 0.015 ms	0.997
eval/Float64/derivative	17.7 ± 1.2 ms	15.8 ± 1.2 ms	1.12
eval/Float64/derivative_turbo	17.4 ± 0.69 ms	15.5 ± 0.69 ms	1.12
eval/Float64/evaluation	3.27 ± 0.32 ms	3.2 ± 0.32 ms	1.02
eval/Float64/evaluation_bumper	1.29 ± 0.047 ms	1.3 ± 0.049 ms	0.99
eval/Float64/evaluation_turbo	1.15 ± 0.063 ms	1.11 ± 0.059 ms	1.03
eval/Float64/evaluation_turbo_bumper	1.28 ± 0.043 ms	1.29 ± 0.044 ms	0.993
utils/combine_operators/break_sharing	0.0396 ± 0.0013 ms	0.0382 ± 0.00055 ms	1.04
utils/convert/break_sharing	28.4 ± 3.2 μs	27.5 ± 2.8 μs	1.03
utils/convert/preserve_sharing	0.101 ± 0.008 ms	0.0994 ± 0.0057 ms	1.02
utils/copy/break_sharing	28.8 ± 3.7 μs	27.9 ± 2.7 μs	1.04
utils/copy/preserve_sharing	0.101 ± 0.0073 ms	0.1 ± 0.0058 ms	1.01
utils/count_constant_nodes/break_sharing	8.92 ± 0.51 μs	8.59 ± 0.31 μs	1.04
utils/count_constant_nodes/preserve_sharing	0.0913 ± 0.0086 ms	0.0865 ± 0.005 ms	1.05
utils/count_depth/break_sharing	9.25 ± 0.44 μs	9.81 ± 0.3 μs	0.943
utils/count_nodes/break_sharing	9.17 ± 0.46 μs	8.38 ± 0.28 μs	1.09
utils/count_nodes/preserve_sharing	0.0901 ± 0.0089 ms	0.0871 ± 0.0053 ms	1.03
utils/get_set_constants!/break_sharing	0.0341 ± 0.0035 ms	0.0336 ± 0.0025 ms	1.02
utils/get_set_constants!/preserve_sharing	0.178 ± 0.0099 ms	0.175 ± 0.0084 ms	1.02
utils/get_set_constants_parametric	0.0478 ± 0.0036 ms	0.0449 ± 0.0028 ms	1.07
utils/has_constants/break_sharing	4.08 ± 0.29 μs	4.28 ± 0.18 μs	0.953
utils/has_operators/break_sharing	1.94 ± 0.13 μs	2.25 ± 0.1 μs	0.863
utils/hash/break_sharing	24.3 ± 1.4 μs	23 ± 1.2 μs	1.06
utils/hash/preserve_sharing	0.101 ± 0.0091 ms	0.0991 ± 0.0071 ms	1.02
utils/index_constant_nodes/break_sharing	25.8 ± 1.8 μs	25.5 ± 1.3 μs	1.01
utils/index_constant_nodes/preserve_sharing	0.1 ± 0.0053 ms	0.0995 ± 0.0058 ms	1.01
utils/is_constant/break_sharing	4.37 ± 0.31 μs	3.89 ± 0.2 μs	1.12
utils/simplify_tree/break_sharing	0.171 ± 0.0095 ms	0.17 ± 0.0062 ms	1.01
utils/simplify_tree/preserve_sharing	0.225 ± 0.012 ms	0.22 ± 0.0098 ms	1.02
utils/string_tree/break_sharing	0.515 ± 0.033 ms	0.48 ± 0.021 ms	1.07
utils/string_tree/preserve_sharing	0.628 ± 0.041 ms	0.588 ± 0.026 ms	1.07
time_to_load	0.249 ± 0.0088 s	0.22 ± 0.0034 s	1.13