CompatHelper: bump compat for Symbolics in [weakdeps] to 7, (keep existing compat)#294

ranocha merged 1 commit intocompathelper/new_version/2025-11-07-00-22-45-981-02390801983ranocha/BSeries.jl:compathelper/new_version/2025-11-07-00-22-45-981-02390801983from

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