It's definitely not normal. I don't experience it at all. Also, if it were normal, there would not be a Technical Service Bulletin out telling how to fix it by replacing the spring mechanism.
The TSB may not cover your MY, but it does show that Porsche considered it a problem and told their mechanics how to fix it showing it is not a normal situation. Here's the TSB info:
TSB #1A/00 Date: 010601 Clutch Pedal - Various Types of Noises
Squeaking noise
Cause:
The clutch pedal power assist spring touches the spring casing.
Repair:
Replace the clutch spring.
Note: There is a new contoured version clutch spring that can only be installed in MY'00 and later vehicles. The boost spring for MY' 98 and MY' 99 vehicles has not changed. The new contoured version clutch spring was installed in production as of the October 6, 1999 from the following VIN numbers
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1987 928S4 Silver Metallic (980)/Navy (TP) 5-Speed
2000 Boxster Speed Yellow/Black 5-Speed
1966 Wife White/Brown Top
1986 Daughter White/Brown Top (Sold!)
1992 Daughter White/Blonde Top
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