Update workshop25.md

Author: num3RIK

pages/workshops/workshop25.md

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-**Lecture 8 - to be announced (Luiz Morales)**
+**Lecture 8 - Plasticity (Ralf Hielscher)**
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+deformation tensors, slip systems, dislocation systems, Schmid Factor, Taylor factor, 
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-**Lecture 9 - Plasticity (Ralf Hielscher)**
+**Exercise 8 - Plasticity (Ralf Hielscher, Vivian Tong)**
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-deformation tensors, slip systems, dislocation systems, Schmid Factor, Taylor factor, 
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 *lunch*
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-**Lecture 10 - Parent Grain Reconstruction (Ralf Hielscher)**
+**Lecture 9 - Parent Grain Reconstruction (Ralf Hielscher)**
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 determination of orientation relationships, phase transition, parent grain reconstruction, transformation
 textures, variant selection